You can find the Become a Bestseller Workbook inside the BAB course in Teachable.
Click into the Writing, Book Production, or Marketing and Publishing section.
On the right hand side of the screen, you'll see a light blue box that contains the Become a Bestseller Workbook.
Click on the workbook and download it to your computer. You can follow along with it as you complete the course lectures.
Here is an image of the workbook for reference: