I published 4 books. First I used chapbooks.com, which no longer exists. After that I tried lulu.com and the problem was the distribution. They don't have a good deal to distribution worldwide and part of my audience was in other countries other than US. I then switched to using createspace from Amazon. The process was a lot easier and smoother with Amazon and the distribution is better there too. I started with the print on demand version and it was very easy to make the ebook version. The books are available on Amazon site and can be sold worldwide.