Jack,
Your business model has a lot to do with the choices you make about publishing your book.
One easy and inexpensive option for getting your book to market is to use Amazon's print-on-demand service to supply the books (
www.createspace.com). They let you use your own ISBN number (unlike others) which makes you the publisher and not them. They also have the option of using one of their ISBN numbers if you aren't concerned about being the publisher.
Your book will be listed in the Amazon catalog and you set the price. Amazon processes orders, takes their fees, and sends you a check for the balance.
They also let you publish CD's and DVD's as well.
One more thing to think about: it's EXTREMELY hard to make much money selling copies of a printed book. The marketplace has a pretty rigid set of expectations for the value of a book (which has no relationship to the value of the content.) If you are selling non-fiction, you should broaden your product line.
I love books, but when it comes to the non-fiction 'how-to' type content that I usually publish, I make much more money selling ebooks, video training, and audio products. If you take the exact same content from a typical book, break it up into small chunks, and present it weekly through a video, you can create a membership website that can earn monthly income of $27/$67/$97 or more.
Even if you are selling fiction, you should be creating ancillary products in a variety of formats. A Kindle edition is easy to create, so is an audio book. Kindle books tend to go for less money, but an audio almost always sells for much more than the print edition.
Andrew