I could recommend you A LOT of books as Satanism is a worldly philosophy so thus it endorses worldly knowledge. However I will share with you a couple of posts that have helped me substantially. These posts are well written and the author is a member of the Church of Satan
Priesthood so he is an authority upon the subject.
1. HOW NOT TO BE AN IDIOT.
Pretty much expresses the importance of getting the fundamentals under your belt. Once you do that a nice follow up by the same author is linked in my signature.
2. Deep Satanism
An expansion on that essay is found in Magister Sass's book ESSAYS IN SATANISM Vol. 1.
It is an emphasis again on reading the fundamentals but not just stopping there and expanding into the bibliography of The Satanic Witch
Also The reading list for fiction/nonfiction on the Church of Satan
Studying Satanism is a life long project. Be thankful we have access to the internet because before it the members didn't have as easy access to such things.
Best of luck!