Presumably you're on road tyres in 195/50/15 if so just drop the pressures 2-3 psi and then go out and build, build, build. Use the turn in and apex cones and also the brake boards to gauge your braking distances. Also use the last lap as a full cool down lap, this is important as you don't want the car sat there in the paddock red hot.
On returning to the paddock after your first session and cool down lap, turn the car off leaving the handbrake off. Then either leave the car in gear or chock the wheels. Then check your tyre pressures, you'll want them at around 29psi front, 28 rear. I state these as once the tyres warm up again then they'll inflate to the recommend 32/30 psi.
As you build throughout the day you'll be noticing your tyres becoming greesy! You'll have to play about with your pressures then, more than likely lowering them further, as when the tyres feel greesy they're overheating and over inflated and will wear at a greater rate. You'll want to back off a lap or so to let them cool down, so you can get a few more decent laps in. This also applies to the brakes if standard, as you may get fade so just back off and let them cool.
Keep an eye on fluids throughout the day as well. I'd take if possible a spare functional wheel and tyre, top up fluids, jack, tyre inflator, towing eye, tyre wrench, spare front pads, screw drivers etc... Just anything you have if you can carry it as you never know, lol. Remember being a novice day most TDO have first come first serve garages.
Be safe, be respectful to other drivers and if you can get some tuition as it will be invaluable to make the most out of the car and track.