Go to player card. Click edit player card. Then you customize your own. If you don't do this, it will just display your rank.
go on options
MW3 is after COD black ops.
You get to change your care package. For example if you get amo, you can change it to a spy plane
SAD.
if by levels you mean campaign you cant prestige but if your talking about your rank then its level 50 and there are 15 prestiges
I believe you have to unlock that with COD Points, and it should be in the customization tab
no
by getting head shots and kills
Its how you rank up in the game.
68
Cod black ops
cod: world at war & cod: black ops