Hi there, well I asked the same question quite a while ago and found out that Kindle is a good place to start. It is free. I started there with my poems but have not been able as of yet to finish my book.
You could look into that.
Whatever you do , do not use Xlibris.com it is a big scam. I talked to her for a few months over a year ago and trusted her. I send her all my poems and even try to get money to get started. She offered me great packages (fake) and then I was led to signs that warned me against them.
But I have heard good things about kindle and sometimes just posting part or a page of your book right here on hubs will lead you to many people who are nice enough to help.
Good luck and many blessings to you