Tanks are available only on certain maps, and can be used from level 1. Note that you should be a bit to the rear of the tank to be able to enter it (Xbox 360 version).
Yes
You can drive tanks, motorcycles, jeeps, and armored cars.
There are in the campaign level "Blood and Iron." It is aprx. level #8 on the campaign.
the level is 65 you get m1a1 carabine and flamethrower
by killing enemies, if your talking about online
No
Yes, the level is purely online it doesn't have to do with your save game.
Yes, you can level up online just like for the xbox 360, ps3 and computer. I know this for call of duty 4 and 5 for the wii but have never played call of duty 3 or prequals so don't know about them.
Just look for it. you will find it
If you mean higher level... you play online and kill people....
In call of duty, world at war, hold square for ps3 and i think its x for xbox. same as how you get in.
The flamethrower is unlocked at level 65 along with the M1A1 carbine.