Call of Duty Black Ops: How do you get a High Killstreak tips please help?

The Aug dual mag is a good gun to use, and Sleight of Hand is a good second perk. What I normally use is Lightweight/Flak Jacket and Ninja is a must for Perk 3. You should probably use Frags and Stuns, as well as a claymore. Don't camp for killstreaks, and try to stick to the outside of the map and pick off targets with burst fire. The killstreaks you should use are the Spy Plane, the Blackbird, and then Attack Dogs. Good Luck!!