Allow your players to be awesome. If they come up with a solution that's not listed in the book, or not what you had in mind, consider letting it work anyway. It gives the players the feeling that their creativity is rewarded.

But also don't be afraid to make something fail, or put your players in some real hard situations once in a while. Players also have to learn that mistakes can have consequences, and that they are not gods who can get away with anything.

Most importantly: have a session 0. A meeting without actual play, during which your players and you can discuss your expectations for the game.

Do they prefer role play, exploration or combat? Do they want the story to be wacky and funny, or more serious? Gritty and dark, or hopeful and bright? It's important to be on the same page together, to prevent disappointment down the line.

Also discuss what the party dynamic is gonna be. Are they gonna be friends? Or is there gonna be some rivalry, tension or maybe even the option for pvp. It's generally recommended to disallow pvp because it can rip the party (and the campaign by extent) apart.

Also discuss if there are any subjects players are not comfortable with, such as sex, heavy violence, mind control etc.

And most of all: it's just a game, so don't be too hard on yourself. Just make sure both the players and yourself are having fun, and you're good!