The first thing you want to consider is if you simply want it published or if you want to be able to sell quite a few.
If you are only interested in getting it into book form, you can to to any number of Print On Demand publishers.
Be warned! You will not be able to sell them in the Brick and Mortar stores unless you purchase a rare package which allows the retailer to get refunded on books which don't sell.
POD publishers are fine if you have a LOT of time to follow up on publicity and setting up your own book signings and such.
If, however, you wish to immediately start selling books and want someone else to worry about advertising and such, then you should get a minimum of three fully edited chapters and start looking for a reputable agent whom will find a publisher for you.
Finding an agent is not as easy as it may seem. You have to "audition" for them with your material and how you approach them.
There are a good deal of books out there on how to find an agent. FORGET THEM. You will find a wealth of information on the Internet and, in deed, right here on the Hub Pages Website.
For more information, you can check into the Hubs on the subject and you can also check out a copy of The Writer's Market from your local library.
I wish you the best.