24 Feb XLII A.S.

The first source you should consult -- before any other book, website, whatever -- is The Satanic Bible by Church of Satan founder, Anton Szandor LaVey. You can pick it up through the CoS Emporium by clicking here. It is also available through all major booksellers.

Other books from the Church of Satan are also available, and they are each recommended.
Ever Forward!
Magister Matt G. Paradise - Church of Satan

Purging Talon | Bearing The Devil's Mark @ Amazon | The Book of Satanic Quotations @ Amazon

Terror Transmission | TT on iTunes | TT on Facebook | TT on Twitter | TT on Google+ | TT on YouTube | TT on tumblr
"The world isn't black and white. It's grayscale" - Steve Wozniak