The Dolls have two great albums and are really worth your time. The Johnny Thunders and the Heartbreakers album L.A.M.F is good also (it has some great songs especially Pirate Love, Get off the Phone and One Track Mind). Sleazy junkie rock. Heard much of The Cramps?
Punks more a attitude than a style of music. The Pistols and Ramones are more rn'r bands than punk bands (as were Dead Boys, The Germs, Crime, ect). The first notable "punk" band was Crass in my opinon. They started punk as we know it today.... very influential on the whole scene.
"You said that we were trash... well the name's Crass not Clash. You can stuff your punk credentials cause it's you who take the cash"