Invent your own system. Learn to think for yourself. I made my own system, based on what I could relate to. Its the link in my signature. Its the progress that I made over the course of a couple of months. I reread it weekly. I read other books, and they say the same things, all in their own unique language.
There are so many systems, because each author discovered it himself, could not relate to anyone elses, and therefore thinks his way is unique, and so writes yet another book about the subject.