I need help with COD Black Ops multiplayer?

i use AK47 w/ surpresser and CZ75 with semtex and flash bang with claymore and for perks i use hardline pro warlord pro and hacker pro and for killstreaks i use RC-XD, for a care apckage i would use SAM turret but only if you have hardline pro cuz then whe nyou get the care package with 3 kills for the SAM turret you double tap square or B ( for xbox ) and you can change the care package and its for 3 kills instead of 4 its just faster. and attack helicopter