I want to start playing dnd but i dont know what to buy. I want to make my own character. Can anyone help?

Dnd Beyond is free and gives you access to the basic rules, but if you want the physical books, than I would start with the players handbook. You can find online dice rollers as well but if you don't want to use the internet you should also get yourself a set of dice. As for character sheets I know that there are places where you can print them out. 

First suggestion: don't buy anything (yet). You can make a character here on DDB using nothing but what's in the free Basic Rules. That way you can try the process and familiarize yourself with how building a character works, and if you want you can look through the Basic Rules to see how the game is played in a technical sense (chapter 7 is where the most rules are you'll need the most).
If you want to start playing, you'll need a group first - google "Dungeons and Dragons in [your area]", google D&D discords, try local gaming stores, look on other sites like roll20 or ENworld, try the Looking For Group forum or the Play-by-Post forum, or try Adventurers League and/or the store/event finder on the Wizards site. The Dungeon Master for the group will tell you which materials are allowed, which aren't, and what the rules specific to their campaign are. If they use D&D Beyond as well it's quite possible they'll be sharing all that content with everyone in the group, in which case you'll be able to use it for free as long as you're part of that campaign. Should you enjoy it and wish to continue and invest a bit, you'll then have a better idea of which books have the best content for you (in any case, the Player's Handbook should really be the essential first purchase). 

you dont need to buy anything, DDB has the basic rules for free, which gives you at least 1 subclass for every class (apart from artificer). You can make a character and play for free. Here is a guide for new players, and this is a link for a free adventure on DDB. Check these forums for players and groups.

I would check out what is free in terms of subclasses and stuff before buying anything, but I would recomend the Players Handbook as the first thing you buy if you want to. Then it would depend on what you want to do in terms of DMing or playing.

Thirding the suggestion to not buy anything until you play around with the free product.  If you're enjoying it, check out the Buyers Guide in this forum once you have an idea of what you think you might need.

fourthing. don't buy.

once you've gone through ALL of this stuff and still want to up your nerd rating, then think about buying

https://onwaterdeep.blogspot.com/2021/07/list-of-free-dungeons-and-dragons.html

If you decide you enjoy dnd after you try free resources buy a physical copy of the essentials kit.  It comes with a print adventure a DnDBeyond code for that adventure and 3 extra adventures and a 50% off the players handbook code.  Its a great way to get started.

As others have said, it is best to not buy anything and try out all the free stuff first. Most GMs and players generally would not mind letting you borrow their books. For the official stuff, D&D Beyond already got the Basic Rules and Elemental Evil's Player Companion freely available and usable. Wizards also got some free adventures on DMS Guild available for download, and some on their own site (and some more other stuff here), and you will find other free resources between those two sites too. Beyond also got some free adventures too.

For semi official stuff, if you do not mind using pen and paper, there is a massive trove of Unearthed Arcana content available on the official D&D site. These are mostly play test material, and they tend to be more powerful than the final published versions. For quasi official stuff, the Magic team has released a Plane Shift series of PDFs that is compatible with 5e.

For more "legitimatized" homebrew, Beyond hosts quite a few of Matt Mercer's homebrew on here that is freely accessible to anyone, with the Blood Hunter being the most prominent, along with a few other free subclasses. Beyond also had brief collaboration with Riot Games and created Dark Tides of Bilgewater, and I think it was pretty interesting; while it is no longer available on here, Nerd Immersion has covered the classes, monsters, and magic items extensively; there is also an adventure in it as well if you Google around. If you got an hour to spare and want to dip your toes into the homebrewing on Beyond, you can watch Beyond's video and follow along on homebrewing classes and homebrewing magic items.

I'd certainly use the free stuff to test whether you like it or not. D&D can get expensive quickly, and you don't want to start down that road until you know you like it.

Once you've estabilished that you do like it, I, personally, think it's a better experience a tally having and using your own stuff. If you have people to play with, then I recommend getting the Essentials Kit. It's around $25 and gives you:

A book with the basic set of rules and instructions on how to crate your own character, plus some races and classes to use.

• A few character sheets.
• A set of dice. Nothing special in terms of quality, but it's a set of 11 (an extra d20 and extra 3d6s), which is really useful for character creation.
• A dungeon master screen to hide their actions.
• An Adventure (Dragon of Icespire Peak) for levels 1-6. It's pretty good for beginners and introduces you to the staple races of D&D, apart from Elves.
• A voucher for D&DB that unlocks a digital copy of Dragon of Icespire Peak for free. It also gives you 3 more Adventures that are set in the same region and are sequential in their levels (going from levels 7 to 13), giving you a full campaign (the stories seem to be independent though, but it's clearly intended that you use the same characters throughout).
• A voucher for a discount on the Player's Handbook (PHB).

That's everything you need for your first adventure. It's really good value at the end of it - you're paying around 2/3rds of what you would for a normal adventure, getting essentially a full adventure, plus the rules, dice and a discount on more stuff. Don't bother with the PHB just yet, but keep hold of that voucher. Once you've done an in-person adventure, you might feel ready to expand. First, I'd get the PHB, it has the core rules, more races and classes, more equipment, more spells, etc and helps expand your game. It's cheaper in D&DB (like most of the books), especially with the 50% off voucher, but there are drawbacks as well as advantages, so decide if you'd prefer to pay more for a physical copy or get it here.

If you're going to make up your own adventures, then the Monster Manual and The Dungeon Master's Guide are very useful - the latter provides really useful guidance on how to do it, the former will help you provide appropriate monsters to fill it with.

There are other books. You can always ask for recommendations for published adventures here. The other source books are things that by the time you come to want them, you'll know which ones that you'd want. Or you can always ask here.

If you can't get friends etc involved for.whatever reason, just use the free stuff, maybe after while get the PHB. I wouldn't bother with the other things unless you decide that you're going to DM.

I like the Essentials Kit a lot, but only if you're going to run a game. If you're going to be a player for a while first, the PHB is the better purchase. The Kit's dice do make it interesting, but unless you want to run the adventures everything else is somewhat superfluous.

Quote from pangurjan >>

I like the Essentials Kit a lot, but only if you're going to run a game. If you're going to be a player for a while first, the PHB is the better purchase. The Kit's dice do make it interesting, but unless you want to run the adventures everything else is somewhat superfluous.

 True, but I'd argue that since they're here asking us, random strangers on the Internet, rather than someone they actually know and feel comfortable talking with, then that implies that they don't have someone they know that they can work with, or they'd be asking them about this. That further implies that they don't have someone to DM for them, and they'd have to do it themselves or someone in their social circle - someone that most likely doesn't have the DM stuff to get going in the first place. 

I imagine that they are in a similar situation that I was - no friends that play it that I can go to to introduce me, but I did have a social circle wanting to try it out. In that situation, the Essentials Kit is brilliant.

In short, I agree with your statement, but the implied circumstances in turn imply that if they have a group wanting to play, then it's a good first step.

Quote from Linklite >>

Quote from pangurjan >>

I like the Essentials Kit a lot, but only if you're going to run a game. If you're going to be a player for a while first, the PHB is the better purchase. The Kit's dice do make it interesting, but unless you want to run the adventures everything else is somewhat superfluous.

 True, but I'd argue that since they're here asking us, random strangers on the Internet, rather than someone they actually know and feel comfortable talking with, then that implies that they don't have someone they know that they can work with, or they'd be asking them about this. That further implies that they don't have someone to DM for them, and they'd have to do it themselves or someone in their social circle - someone that most likely doesn't have the DM stuff to get going in the first place. 

I imagine that they are in a similar situation that I was - no friends that play it that I can go to to introduce me, but I did have a social circle wanting to try it out. In that situation, the Essentials Kit is brilliant.

In short, I agree with your statement, but the implied circumstances in turn imply that if they have a group wanting to play, then it's a good first step.

My impression is that OP has no group lined up yet, in which case I'd advise trying to find an more experienced group to play with first (going to add Adventurers League to my suggestions for that above), but otherwise you're certainly not wrong.