This will be my first time DMing is there any tips you would give to make my campaign more enjoyable

#1 Have the mindset to have fun. It’s a game so enjoy it. I always go with Rule of Cool whenever in doubt.
#2 Most important. It’s OKAY to mess up and get stuff wrong. Don’t fear making a mistake. I screw things up. So does Chris Perkins, Matt Mercer, Todd Kendrick and Jeremy Crawford. It’s never been a big deal to mess up. Just Roll with it. 

More Practically:

‘Most of what you will deal with is going to fly out of your ass. Players do the craziest random things so get comfortable with improv.

Use a DM screen or make one. Quick access to useful tables, rules and breakdowns that are commonly used. Print off your own tables and guidelines and tape them to your screen that you find come up more often for your group. Like improvised damage or saving DC’s. I tape the “creatures in area effect table” and all  my players “passive perception scores”  to mine for example. But you do you.

Keep an adventure notebook to record things so you don’t forget. Places, names, npc’s, locations, etc. I take notes all the time. 

‘Keep the DMG, Players Guide, and Monster Manuel nearby just in case. 

Music, Snacks and Drinks (age appropriate) are always welcome. Nothing fancy. Put the Witcher or LOTR soundtrack on in the background. You can have tavern music and fight theme music also to help set different moods. I’ve used music from RuPauls Drag race and it was a blast. *** get permission if you are going to stream or publicity upload your DnD game***

Keep a list of names nearby (like the one in the back of  Xanathars) in case have to create an NPC on the fly.

It’s easy to forget things like who is maintaining concentration on a spell or status effects like poisoned or prone. Make a note somewhere to double check that stuff in combat. You can use status markers or rubber bands or soda tabs on minis to help you remember.

Keep a timer or hourglass on hand to use for time based encounters or to add tension to a situation. 

Don’t forget: a 1 and a 20 roll on a d20 is only an automatic success/miss on an attack roll, not ability checks or saving throws.

This table is a life saver. Players want to do something. Just ask yourself how hard you would expect it to be and you get a corresponding DC.

Typical Difficulty Classes

if you are a visual learner, watch some streams or YouTube Videos of people playing to get a feel for the flow of things. 

And if you want to make your own monsters, the DMG has a fantastic section in the back for how to do so quickly. 

And don’t forget, Have Fun. Everything else I wrote is pointless if you and your players aren’t having a fun time. Believe in yourself and have faith in yourself because your players do. Enjoy.

Good, good. 

Well the first thing as a new DM you need to learn is how to...wait for it.... Make dungeons.  Duh, right?  That's why people play D&D- for a well made, interesting, challenging, varied dungeon that has all the right ambience. 

Start by studying the process of creating a dungeon.  First start with an idea, then create some history behind the dungeon and nail down the overall flavor you are going for.  Then proceed to physically outline the dungeon, then finish by furnishing and documenting the dungeon room by room and hall by hall while adding the varied (more than just simple battles) encounters.  

There are several programs that can help tremendously, I am a huge fan of Dungeon Painter Studio and Endless RPG random dungeon generator, both available on Steam.  Use them all the time.  Check out this for more details.  

Good luck! 

After watching the video series that DataDwarf linked for you (it’s pure gold), here are my personal to tips:

1. If everyone is having fun, even if you’re not strictly following the rules, you’re doing it right.
2. If you can’t find a rule in around a minute, make a ruling, let everyone know that’s what you’re doing, and that you’ll look it up before the next session.
3. It’s okay to make mistakes, everyone makes mistakes. That’s the best way to learn how to avoid those mistakes again in future.
4. Reread chapters 7, 9, and 10 of the PHB, the vast majority of rules that you will use almost every session are in those three chapters.

PS- Welcome to the other side of the DM’s screen!!

Unless there is a dead pc at the end of session, don't worry about bad rule calls. Sorry Sposta the fireball did do 10d12. You were right it should be 8d6. 

I started my first game as a DM in October and have a grand total of 7 sessions under my belt.  I'm running 'Frozen Sick' because it's free and bite-sized so I can get my feet wet and set the expectation with the players that this won't be too long if I end up being awful :P

One thing I'm trying to do is think about each player character and set up little situations that give them a chance to shine.  I might not hit everyone each session, but I try to have something basically SCREAMING for one of the players to shine every other session or so.

For example, one of my players is a rogue.  At one point they walk into a shop that is filled with bandits.  The bandits feigned surrendering as one of them approached the barbarian and said words that sounded like he was surrendering.  Because rogues know thieves cant, I told her that she would be given one minute to figure out what the hidden message was in the bandit's message.  I wrote it down for her and told her that the message was hidden in every fourth word.  She figured it out, warned the barbarian and he got to make a bonus attack when the bandits spring into action instead of the party being surprised.

Corny?  Maybe.  But I felt like it gave her a spotlight and the party as a whole benefited in some small way as a result of it.  They seem to be having fun and honestly I think ANYONE who plays is just happy enough to have a DM that they're not looking to judge too harshly.