My friend is contemplating going the self publishing route and she said that this conference had 50% of their workshops dedicated to this topic. The most important thing is cover and the second, is listing your book for free for a limited time. Of course, all of this is hinged on your content. People don’t put CRAP out there because you will lose readers that could be potential long time readers of your books. Take the time to edit properly and if you don’t know how, hire professionals.