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Tire pressures on the street with street tires, I recommend you follow the Porsche Owner Manual. Regarding driving a street tire on the track. It's not recommended to drive with under inflated tires because of several reasons. So you should start driving the car and continuously release the pressure once it starts to go up. Don't go out on cold tires.
Some simple tips. a.) Soften the front anti-roll bar. b.) Harden the rear anti-roll bar. c.) Make sure you have neutral toe or toe out in the front. d.) Don't push with the gas in the corners, let go of it and let the car "swing" around the corner. (This is very common mistake by even some intermediate drivers) e.) Make sure you're running correct tire pressures.