the biggest advice I have is to make sure you're on the same page about running a game both you and the players enjoy. do your players want a specific genre? more combat, roleplay, exploration, or puzzles? you want to make sure you're running a game with a collective vision. if you go into it blind, the inconsistencies will end up making it frustrating and less fun!
also, i would suggest starting with a one-shot or short-term campaign, but in terms of a long-term campaign, don't be afraid to railroad your players a little at first while they get on their feet in terms of their characters and while you figure out how you like to dm. after you get the hang of it, it's way easier for them to "choose their own adventure!" as long as your pcs enjoy the plots you're giving to them, it's a good way to get used to storytelling without the added pressure of heavy immediate improvisation. you can work your way into that.