You may find this next one interesting. Amazon offers independent writers the option to publish their own digital content. A lot of information can of course be found on the website, but they have also made a nice manual available for Kindle. You can download this for free.
A guide to publishing your book on Kindle with Amazon’s Digital Text Platform (DTP). DTP is a fast and easy self-publishing tool that lets anyone upload and format their titles for sale in the Kindle Store.
It's Your Thing.
Have a book you want to sell? Sign up with Digital Text Platform and publish your content in the Amazon Kindle Store.
If you have an Amazon.com account, you're already signed up with Digital Text Platform. Start publishing now!
Digital Text Platform gives you everything you need to become your own publisher today. See for yourself.
Publish on Amazon Kindle with the Digital Text Platform