There are books you can get that give the general idea of an "introduction". One I read not too long ago was simply entitled "Satanism" by Brother Nero; it gives a good general outlay of the philosophy behind Satanism, or at least, Nero's opinion on it. While I disagreed with certain things in it (I'm not a Theistic Satanist, so, I'd be almost bound to) I still consider a good introduction. Having spoken with Nero since reading it, a "Book 2" was in the works to help outlay things like further philosophy and ritual, but as I can recall, it was scrapped once the publishing company that published "Satanism" went down the plug.
But yeah; there's my two cents.