well it depends on your path. certain ones teach different things. like with Wicca you don't harm other beings, a bit contradictory for a Spiritual Satanist.
in either case, meditation would be a great place to start. don't get discouraged if you can't do it instantly, just try to clear your mind for 30 seconds, then gradually increase the time. from their, energy work, shielding, circle casting, basic stuff.
again though, without knowing your path, no one can really give you specific information, links, articles, books, and other learning aid.