I don't find sponsors.

This is how it works (and I should write a post about that):

You write a book in Word, Scrivener or other word processor.

You sign up with kdp.amazon.com for free.

You upload your book - the document file.

And hit Publish.

You can see the books I've published there under my own name: http://author.brittmalka.com

Anybody can do that - to my knowledge. I haven't heard of any country restrictions.