1. Create the e-book in the .epub format. We used the open WYSIWYG ebook editor Sigil.
2. Create a Google Books Partnership Account.
3. Follow the instructions for submission EXACTLY and set your price.
The Google Play e-reader is actually very nice. You can seamlessly read the study guide on many different devices. The epub format allows for reflowable text. Please feel free to download the book and study the mark-up in Sigil.
Doing this was a fun exercise and I hope the guide might help some folks.