If you want to find out more about Dianetics and Scientology, the best way to do this is to read an L. Ron Hubbard book on the subject. I personally recommend you read Scientology: A New Slant on Life.
I can't seem to sum it up. It's such a broad ranging book that it helped me in many ways. Just make sure you read it carefully and that you don't accept anything unless it's true for you. Make sure you look up any unknown words. If you go past any word you don't know, it can ruin your comprehension of the whole subject.