Alright, chapters, try not to make them too long, but definitely stay away from keeping them too short. 800-2000 words. My longest chapter I've written in my story 99 was three thousand words. I couldn't help myself. You don't want to update every single day either, even though i really want to. I am a fast writer, but I know I wont get a lot of views if I post the whole story within a week. Give it time.