This article by Ali Hale presents an overview of practical steps to follow to make a book available on Amazon.
Especially useful are the suggestions on factors to consider while deciding whether to publish as an ebook, physical book, or both.
How to Self-Publish a Book on Amazon [With Tools and Resources]. (n.d.). Retrieved July 17, 2019, from https://www.dailywritingtips.com/how-to-self-publish-a-book/