You may be able to come up with some takeoffs. Toyo, Hankook, Yokohamas and many others. For a first outing the overall grip is not real important, Its just not worth loosing a good set of street tires. Most street rubber is short lived at the heat levels on track.
Look into a local chapter of the BMW club AUDI club or NASA and check there drivers school schedule. You will be out with an instructor guiding you. Can be a bit frustrating but the learning is worth it. Getting some good instruction on how to transition from brakes to turn in is real important in a heavy car. When you get it right the speed will come in naturally with less wear and abuse to the car. Doing it wrong can smoke your front tires off in one session.
Then look for some track days to get some seat time in. <img src="/forums/images/graemlins/smile.gif" alt="" />