I've moved your question to the InDesign EPUB forum.
Producing good ePubs in not intuitive.
Take this step-by-step online course and it will explain how to successfully create ePubs and how to subsequently also convert them into mobi files which you can uploaded to Amazon to be read on Kindles.
Tablet users can download apps that can read both these digital formats.
And, of course, you can post specific questions on this forum.
I believe Lynda.com offer a free week's trial.
Yeah I figured I complicated things by not looking ahead at all media. Fortunately I am a Lynda subscriber so I'll definitely watch it. My hope was trying to salvage my current project without having to go in and modify a bunch of things, but it looks like that's unavoidable at this point. Thanks Derek.