Oh - and all of these are free.
If you don’t have a Kindle, aren’t sure you want to buy one, but would like to try the experience of reading e-books—and if you have a PC computer—you can download and install a free application from Amazon.com, Kindle for PC, that will allow you to read Kindle files on your computer. It’s free, and you can find it at http://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000426311
If you want to publish your book at Amazon.com in e-book form for Kindle readers, the actual publication process is free (though you may invest in things like purchasing a professionally-made cover, registering your copyright, or buying an ISBN—but these steps are optional, not required). The program is Kindle Direct Publishing, and you can sign up for it here: https://kdp.amazon.com/self-publishing/signin
Amazon has free guides to publishing for Kindle. You’ll need a Kindle or Kindle for PC to read them, unless you download a .pdf file instead. Here are a few of them:
Building Your Book for Kindle
Publish on Amazon Kindle with Kindle Direct Publishing:
Kindle Publishing Unleashed
Calibre (pronounced like the caliber of a bullet) is a free program that you must download and install. It has its own e-book reader, and best of all, it can format your manuscripts as e-books for Amazon Kindle, Barnes & Noble Nook, IPad, and others.