Jen,
campsite is pretty basic - it's more just an open field. There is power to this area but that's mostly used for the scopes.
You don't really need to bring any kitchen or cooking stuff as you can use the facilities there. There is a big kitchen with fridges, stoves, pots, pans, cutlery, kettles, plates, etc.
You would need to bring your own food and drink, but most people opt for the Feast on the Saturday night.
Bring as much alcohol as you can pack
..... helps keep you warm when your out observing
....
Yes, you'll need heaps of warm clothes and sleeping stuff ... it does get cold at night.
But the days are usual good.
Toilets and shower facilities are also provided ... they even have hot water
There are also plenty of people on hand to help erect tents, etc, so that won't be a problem.
As mill said, bring your scope!!!!