Hi! Thanks, that’s a good question. I already sorta covered this in the FAQ but might as well go into more detail
I start out with a general idea of what’s going to happen in each chapter and try to write down most of it before I start thumbnailing. Emphasis on “most of it” - if I have every detail already set in stone when I begin sketching and inking, it’ll start to feel stale and boring. Flexibility is more appealing to me. The story evolves in my head constantly so there’s a whole buch of stuff I’ve added or changed on the fly, sometimes at the last minute even.
This episode with the mafia kids for example I originally estimated to be just one chapter (40-60 pages) long, but ended up writing so much material it had to be split into a two-parter, and now it’s actually becoming a three-parter! It transformed from simple action shenanigans into something more meaningful and exposition-y, which I felt was an improvement but demanded a lot more pages to really work the way I wanted.
Basically this is why having complete creative freedom is awesome. You can just mess around behind the scenes as much as you want, doesn’t matter as long as the pages get drawn on time hahaha