I agree with Steven Spatz in this post – putting books (ebook or print) is a must for Amazon, but don’t stop there. The other company that has made it very doable is IngramSpark. They are not as user friendly or free (as compared to Amazon), but their distribution options, known name and quality of product make it worth the small investment and time needed to set your book(s) there as well. Though I would not use IngramS. for your ebook – there are many more and less expensive options – my favorite being Smashwords, since they put you ebook on ibooks, B&N, Kobo, library distributors and more.
The #1 mistake made by self-published authors! Here is a list of book distributors for worldwide book sales in addition to Amazon and Amazon Kindle.