You can see here a short video I made about making a storyboard for a book. It will only take 3 minutes, but making a storyboard can take much longer than that and that’s not a bad idea.
Before I storyboard something, I will probably have written the story down as words. But this isn’t always the case because I often find the story by working within the storyboard by drawing. It’s a chicken-and-egg situation and every book is different.
There’s an earlier film about how to make a book dummy, which would be the next step in the process for me once I have a storyboard and text layout I’m satisfied with.