The best way to learn Scientology is a full chronological study of all the materials. Start with the books and add in the lectures as you come to them. By the time you complete the full books and lecture series, you will know Scientology.
Then, if you really want to cap it off, throw in the Congresses and you will have the complete picture!
I've read all of the books before, some many times, but studying the Basics has given me a new and heightened knowledge and awareness of the data of Scientology.
I recommend you do it, yourself.
There's more truth than ever in the LRH statement "may you never be the same" when you study the Basics.