Here's a good site with information regarding publishing...
http://www.booksjustbooks.com/
They strongly advocate self-publishing. One book that I've seen -- connected in some way to the website -- covers everything on self-publishing including calculating costs, how and where to sell, etc.
Hope it works out for you.
Sure takes a hell of a lot of discipline to finish.
Starting is easy (speaking for myself, anyway).
Friend of mine told me about the site, and he has the book that I mentioned. I'm seeing him tomorrow and I'll make a point of finding out the title and author.