>>6079352I say only prepare enough content to last you through your first thread. See how things with how your players vote, what they focus on, and what plans they make and go from there.
Don't plan TOO much out but have enough where your players can enjoy a small taste of what the rest of the quest would be.
Let's say, for the sake of example, you're running a quest where you're some Fallout wastelander doing odd jobs. Write a handful of odd jobs the players could be interested in and the rough layout of two or three towns they could visit.