Hey. Wow. Fifteen and looking to get a book published? For the record, you. are. awesome.
As far as how to do this, if it's at all possible for you to go to a writer's conference, it could be invaluable to you. Going to workshops, it's amazing what you can learn about the business side of the writing industry, not only in the classes themselves, but by talking to whoever you end up sitting next to! Writers of all different levels go to conferences, and just chatting with some people who have been where you are can help get you pointed in the right direction. (I was *really* tempted to say "pointed in the *write* direction, but just so you know, I resisted.) Not only writers, but editors and publishers as well attend these functions. Networking, my friend, is a beautiful thing. It could not only help get you started, but help you make friends with the same passions that you have.
And don't worry about not being taken seriously because of your age. Honestly, I'm sure some people probably won't take you seriously. But it's amazing how many great people are out there who love helping aspiring writers get their start.
Oh, and, I do have a warning about self-publishing: *very* few of them make it. Unless you've got a whole lot of dough to put into printing the books and the advertising for them, it would probably be a much better investment to go to a conference. It may take a little longer to get your stuff out there, but once it is, your work will have the potential to reach a much larger audience.
Anyway, best of luck, killerbaboonbud! Keep writing! (Heh, like I have to tell *you* that.
