My tune agent castor rods have done a lot more than 6 laps and I've had many unfriendly encounters with the curbs and they still look shmick as. I'll admit the older ones for the Silvias look like dried spaghetti though.
And yes, tyres, lots and lots of them. I've had good results with admirals. Cheap and they wear evenly right down to the carcass and don't delaminate at high temps. the Federal 595-ss are also good.
Get ready to buy HEAPS of tyres. Buy brand new ones though, 2nd hand ones you'll just spend the whole day in the pits swapping them over.
+1 to track time too, any track time is fine, even if it's not drifting, you just need to learn how your car behaves on the track\at the limit.