/lit/ - Literature

Alright my n-words, I've decided that I'm going to make a web serial and put it on royalroad to try to milk the reta-I mean generous individuals there for shekels maybe if it turns out they like the idea I have. My question to anyone who's done royalroad is: how much of the story should you have pre-planned and how much pre-written before posting the first chapter? I have some basic worldbuilding and about 50 chapter outlines done but I'm not through the first major arc yet.
Basically I just want to know what's worked for people in the past for making sure they didn't write themselves into a corner when doing a story that is designed for indefinite expansion.