1. The Satanic Bible is available in most chain bookstores, i.e. Barnes and Noble, Borders, and Waldenbooks, in the occult/new age section. If you can't find it there you can ask them to order it for you. It can also be purchased online at Amazon.com or the CoS Emporium
2. True Satanists are people who agree with and follow what is written in the Satanic Bible. The red card isn't what makes you a Satanist.
3. The Enochian keys are only included in TSB as a sort of ornament to rituals. The actual philosophy of Satanism has nothing to do with Enochian magic.