zzirGrizz one of the best if not the best Call of Duty player out there, known for his sniping commentaries where he scores insane amount of kills has been doing a series of tutorials to Black ops.
This tutorials can help you get the first blood and rack up some sick tomahawk kills for either your personal amusement or how I like to call it: LULZ; or your montages.
This is on the map Hanoi:
This is on Summit:
And this is on Firing Range:
Enjoy, and please tell me if these tips helped.