I have some experience with writing books and short novels.I wrote some fan fiction and published it on wattpad and I got lots of fans.Anyways, I started writing something truly my own and I have looked up the publishing process.Unless you have a contract with a publishing company then your best options are publishing it online via itunes or any other online service, or finding a self publishing website.What that means is print on demand.I think that amazon offers this service as well.This is all I can remember right now.
EDIT: Be careful if you are signing with a publishing company,cause in the contract many times it states that if you don't publish a second or third book with them then they ask you to pay back the signing bonus.