If a car trackday is anything like a bike one, ideally don't start with open pitlane - some won't let you anyway. Pick a novice group and take it steady. Can always go out on the back of the group until you find your pace etc. Just hard to remember its not a race!
I'm looking forward to doing my first car trackday on 2013 so will be interested how you get on! Bike is getting close to now being a track only weapon so will be interesting to take the Tourer on track!