Lotta new people showing up. Hopefully, you got caught by the welcome committee and given the scoop. If not, here's the drill:
You're in Lawrence, Kansas, totally different world. Beware of demons and other monsters, take the classes to find out what's what. If you don't have an amulet to keep from being possessed, you can get one from a couple of different places. Tattoos more reliable, cause it can't be ripped off. Hurts like a bitch, but talk to the Winchesters if you want one.