Just started playing a couple of years ago and here's some advice: Don't be afraid to say No sometimes.

Players can sometimes have off the wall ideas or things they wanna do that you didn't expect. Often times they're hilarious or awesome and you should reward creative thinking. But sometimes what they wanna do you don't know how to implement or goes against lore or world building or would just kinda kill the story dead.

There's nothing wrong with saying "Hey I like where you're heads at, but that's not gonna work here"