One of my favorite professional development sites is a blog by
called Helping Writers Become Authors
A couple of years ago, she did a 15-session series of weekly blogpost about character arcs and story structure that is amazing!!!
If you don't like to read blogs, NO PROBLEM. She podcasts most of her blog posts and embeds them in the post so you can just click and listen. In this series it begins on Part 2--you'll have to read part 1.
Here's a link to the first post in this series:
best part of the lessons are the questions she puts in each segment that you can add to your story bible (or use to create one) to deepen your characters and story.