Congratulations Dave! About a year ago I self-published my first book and it ended up being the best thing I ever did (so far). How did you write the book? I used LaTeX for mine, less mess with the tools! Another thing, have you considered going Print-On-Demand as well? I've got my book on Amazon using CreateSpace, they don't take a lot of the money and the book gets good exposure; while I also have a DRM free PDF, ePub and Mobi. As well as on Kindle.

Good luck with the sales and again, congratulations on becoming an author!