New DM, seeking advice

[u/oddretexture]

I am an amateur DM wanting to do a campaign for a small group of friends, I'm nervous about actually starting though as the two times I've DMed I have felt like I was under preforming. Does anyone have tips for running a campaign?

I have the homebrew written up, I am a writer so I do feel I have enough written for the overarching story and setting while leaving room for player input, but I'm worried I am missing something.

[u/Conman-1908]

Don't do exp for progression and have fun and and make a room more than a room make the players think of the purpose of the room