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: The Fundamentals of Thought.
This book really helped me with doing a fantastic job of explaining the basic tenets of Scientology. It does that so good that even though I've read most of the more advanced books, I'm getting a change out of grasping the basic principles fully for the first time.