Do your research. A lot of it. Self-publishing is a very involved process. Unlike traditional publishing, you have control over every single decision that needs to be made. It may not be for everyone. Before leaping in, research self-publishing and traditional publishing, and see which one would fit the best for you. After writing your first draft of your book and deciding you're going to go the self-publishing route, being by researching the biggies: editing, cover design, formatting, distribution options, and marketing techniques. Take your time, and make a plan. I have documented a lot of my own research process over on my blog, so be sure to go check those posts out. Just remember, everyone's self-publishing path is DIFFERENT. What works for someone may not work for you. And what works for you may not work for someone else.