Hi! I'm new to DMing and I've started a tabletop gaming club with some of my students and I'm also still a relatively new player! I'm looking for inexpensive campaigns that would be good for beginners all around but I also personally need it some come with a script of sort for what I should say, I know that there's a lot of improvising and I'm comfortable with that part of it but having a script would be a great starting point for me! If you have any suggestions or links it would be greatly appreciated!!

Hi!

I would recommend to either go with:

(a) Frozen Sick. It's a free adventures for starting characters, available on this site. Look under Sources > Adventures > Frozen Sick

(b) Lost Mines of Phandelver, from the starter box. It's regarded as one of the best adventure modules and includes pre-generated characters for new players, and is intended to be run as your first time DM'ing.

As for a script - you won't find one in any module, because the game doesn't work to a script. The prewritten adventures include text in boxes that is intended to be read out to the players but it is not long or detailed. For example, here's one from Frozen Sick:

Snow gently falls from the sky and wind bites your cheeks as you stand in the graveyard of Palebank Village, a fishing outpost of Uthodurn that is home to several hundred dwarves and elves. The sun is low in the sky, sinking behind the fresh grave of Urgon Wenth, an old dwarf who caught a curse or disease that turned him into an ice statue. The folk of the village have gathered to pay their final respects to Urgon’s frozen remains.

But after reading that out, you have to improvise and describe what the PCs see, what the NPCs do, and what happens. There are limitless possibilities, so the players will be constantly asking you things like "Can I get my beer in a clay mug instead of a glass?" and you'll need to decide whether that's possible, and then describe the clay jug to them. 

Lost Mines of Phandelver and Dragon of Icespire Peak are good adventures, especially for new players.

Frozen Sick is great, though the setting isn't as well developed as LMoP or DoIP (within the adventure, before free availablility it was and still is found in Explorer's Guide to Wildemont which is a setting book).  I know Frozen Sick really well, and use it a lot as a "tutorial" adventure and it performs excellently as a "first D&D experience."  IIRC, LMoP and DoIP gets a little more bang out of it in terms of stuff to do (Frozen Sick stops at level 3).  Frozen Sick could be done in one four session with players who know how to play, two four hours works perfectly for a group learning the rules.  I think LMoP and DoIP get more involved. 

Frozen Sick is also a little "railroady" which isn't a bad thing for a tutorial.  The other two modules give the players a greater degree of freedom.

 Basically, compared to the hardcover campaigns, LMoP and DoIP are pretty inexpensive and you'll get a lot of mileage out of them.  I think both do ask a bit more out of a DM than Frozen Sick though, so that's a consideration as well.

As others have already said, you can run the Frozen Sick free adventure to get a feeling of how to be a DM.

Lost Mines of Phandelver is, also, quite easy for beginner DMs and players and it is not expensive.

For a little more money you can try Dragon of Icespire Peak, which is set at the same location as the Lost Mines of Phandelver and is also easy to run. As an added bonus, if you buy the physical box for this, you get a code for the D&D Beyond version plus another three adventures on D&D Beyond, to continue with your players after the Dragon of Icespire Peak is over.

The campaign anthologies (Tales from the Yawning Portal, Ghosts of Saltmarsh, Candlekeep Mysteries) are also a good place to start, as they contain multiple campaigns that can be run on their own or as part of a larger campaign, depending on what you want to do. I am not entirely sure, though, if you need other books, such as the Monster Manual, to run them, or if that is not nescessary.

I used to play as a DM in the past, but when I started the 5th edition (after many years of not playing) I began with Lost Mines of Phandelver. It was easy for me and for some of the players that had no experience with D&D. After that I started Storm King's Thunder, which can be quite complicated some times, but I managed just fine, as I had worked out many issues while running the Lost Mines.

I would pick up Curse of Strahd and teach those kids a thing or two about DnD.

I'm kidding.  Please don't start there.  It's an amazing adventure but there a ton of moving parts in it for a starting group of adventurers and a starting dungeon guide at the head of the table.

I will concur that Frozen Sick and Lost Mines are regarded as great starting adventures. I'm also a huge fan of The Candlekeep Mysteries.  While they are not a campaign as such  each adventure is pretty well done and the book offers hooks and guides to get you and playing.  The first adventure is actually very "dungeon crawl" and a great place for level 1 characters (and level 1 players) to cut their teeth on the basics of DND.

I also feel compelled to pitch my own adventure "The Valley of Plenty"  :  https://www.patreon.com/posts/64570328

Starting in a small town on the edge of civilization, the party signs on to guard a wagon train of pilgrims setting out to build the perfect community.  The adventurers are split from the train and swept through a supernatural fog, emerging finally in a valley they do not recognize.  There, the town of Moon Hollow is beset by zombie attacks.  But what is causing the attacks?  Can they be stopped?  Can the party find their way home again?

This post is publicly open and provides the hook, content warnings, and other notes:  https://www.patreon.com/posts/64570235