I was a goth ...2 years ago.
I had a skull shirt, black nailpolish, black lipstick, a plaid skirt, ripped fishnets, and black shoes. Use A LOT of eyeliner, black eyeshadow and a lot of mascara. And for dirty blonde hair use either a black wig or some black and red hairspray the kind you buy at walgreens for like a buck, and it washes out. Good luck, have fun!!