I've been looking around online, and it says that you can't unlock the other 2 levels for the wii, you can only have the one map that is included when you start the game.
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The Nintendo Wii can only get 3 of the 9 possible zombie maps for Black Ops. see related zombie mode for identification and information on all of the 9 zombie maps
For right now yes. If First Strike is on Wii then no.
It is not enough to have Zombie Maps they must be designed for the Nintendo Wii not the Xbox 360, PC or PS3 just like the game discs. There are no new maps to download to the Nintendo Wii
By hacking.
No. The multiplayer is available straight away for you to play. The only things you can gain by finished the Black Ops campaign is the zombie map Five (which can also be unlocked by a cheat).