"Satan has never needed a book of rules, because vital natural forces have kept man "sinful" and intent on preserving himself and his feelings. Never… - Anton LaVey

SATANISM encourages its followers to indulge in their natural desires. Only by so doing can you be a completely satisfied person with no frustrations which can be harmful to yourself and others around you. Therefore, the most simplified description of the Satanic belief is:
INDULGENCE INSTEAD OF ABSTINENCE

I dont crave companionship. It stands in my way. I live for pleasure. There are few persons who can give me as much pleasure as those acts I perform myself. I would rather create pleasure according to my own whim than be subjected to the whims of others.

Those who spell Magic with a K aren't.