Memez,

to my knowledge there are at least two campgrounds - one is directlly
near the track and the other one ist in front of the gates.
It is alot smarter to buy tickets in advance otherwise you may end up
buying tickets that are not that "prefereable"
The nitrolypics HP should direct you to the ticket counter.
And yep you can have access to the pit area (I think you need to add
some add. bucks)

BTW its never to early to plan your holidays, but we are still in 2010

best regards

Björn