StrengthGamer: There are 3 "Maps" to Zombie Mode in Call of Duty: Black Ops. They are Kino der Toten, Five, and Dead Ops Arcade. Kino der Toten is available from the very beginning of the game, Five is unlocked by defeating the single player campaign, and Dead Ops Arcade is a secret map that can be found by clicking here.
The guide below will be constantly upgraded, with strategies for each round coming in the later week. Have fun and let's beat the sh** out of some Zombies!