Here is the four P formula of success in self publishing, and some starting steps:

Your first step is to learn the business. You wouldn't attempt to open a restaurant or auto repair shop without studying the business carefully. The same applies to self-publishing. Getting your book in print is very easy, often too easy.  Selling books is increasingly difficult, in part because there are so many published every year.  So you must do your homework. 

There are many resources incliding mailing lists and internet searches. But

if you plan to publish books it is essential that you read some books on the subjects of marketng and self-publishing. Here is the url for my short list of books to buy, read and reference throughout your project:

http://wexfordpress.com/tex/shortlist.pdf

Remember, your book may be a lifelong dream but it is also a product. Authoring and self publishing your work may be your form of self-fulfillment but it  is also a business. If you care about profit or even just readership you need too do it right.

First P. PLAN your project, including marketing, product production, review strategies, and printing.

Second P. PRICE out your production and distribution costs, including printing, fulfillment, discounts and price your product accordingly.

Third P. PRODUCE your product, including writing editing,  layout, typesetting, indexing,  and most important cover design.  Some of this you can do yourself and some you should farm out. LIke anyone in business you are faced with "make or buy" decisions. The battle is always between product quality (good) and production costs (bad).

Fourth P. PUBLISH, executing your printing, marketing and fulfillment plans.