UVRay is correct, the idea being life after death through fulfullment of the ego. What you do and leave behind (your art, contributions, etc) gives you that "life".
Gypsywulf, I have noticed that you seem to be just discovering Satanism. While I appreciate questions from someone new, please be aware that this board, the Church, your rituals, and even you life will be exactly what you put in.
If you have read the Satanic Bible, try reading it again. Was there something specific that you did not understand? If so, please realize that the Church has no intention of telling you what to think. Did you notice any political endorsements from the Church? Of course not. Why? This is a religion of the thinking individual. Hell, you will even find that many Satanists don't agree with each other!
A Satanist must be very well read. Once you move from the Satanic Bible, you can go out and find the Church's Info Pack, and those two are a nice combination to get started. The books, radio programs, web sites, and even this board should be enough if you just dig into it yourself. It's not that we are an unhelpful lot, it's just that we expect you to contribute something to your education.
This is not a religion for those who need to be fed ideas or dogmas.
There. Warning over. Go and learn.