Decide on the format you want for your book: ebook, paperback or hardback. If price is a concern for you, ebooks are the cheapest option. Print-on-demand paperback books can be a good option on a limited budget because the books are printed as they are ordered, so you're not stuck paying for multiple copies that collect dust in your house.
Decide how much you can afford to spend on publishing. It's important to pre-determine your budget so you don't overspend on fancy packages. This will also help you quickly weed out publishers that are too expensive or charge for services you don't need.
Use the Internet to research self-publishing companies, the services they provide and their pricing options. You may want to consult the Better Business Bureau at bbb.org to investigate a company's history and reputation before trusting them with your book.
Choose a self-publishing company that fits your needs and budget, then find out how they want you to submit the manuscript and follow their guidelines. Some companies provide editing services and some don't. You may also need to send it as a PDF file or in a word-processing file.
Prepare and submit your manuscript for publishing. Every company is different, so make sure you know what your getting for your money.