I used to sit in the same boat. I've written many magazine articles and a few novels, none of them printed. I decided a couple years ago to write a book, from scratch, and see it through to publication. This year, with the book finished and ready to publish I became aware of the giant self-publishing industry that has risen from the dreges of "anyone's writing" to filter the good stuff to the top... So I heard about createspace (owneed by amazon) and that's where my first book is going. Second book will be entirely selfpublished as I intend to be able to sell books for two or three dollars, instead of createspaces forced minimums... I'll be buying ten ISBNs and going from there. These are things to consider. Good luck and keep trying, and try different methods.
Richard
PS: I blog at richardhowesbooks . com