Well there IS such a thing as self publishing. I have a book too, called Spirit Horses, and I'm going to self publish it. Basically you just make it, check it for spelling and such, the print out a few copies for people you know. Tell them to give you a reveiw and if they like it tell someone. They should tell THAT person the same thing. It goes on and on, until your whole school or even town/city knows! When more people, I would say 20-50, know, choose a price for it. Depending on the length I think that a good price would be $5-10 dollars, plus whatever random cents you want to add. If you want it to be "-and ninety-nine cents" I would just move it up to the next dollar. Even though it looks more expencive when it gets to, say, a cataloge or such, it is easier to count.
Hope you have sucess!