15 pristige level 50
In Black Ops multiplayer you unlock the AK-47 at level 38.
You have to be a level 26.
level 100
You unlock gold camo in black ops, when you reach prestige level 14, level 25.
you prestige so till a high level and then you can buy it when you click on change clan tag
you unlock more emblems
Level 14
Level 35
To level up in black ops you must get kills and earn experience just like anyother call of duty games.
In Black Ops, you don't get an offline multiplayer account. It only shows your playercard from your online account. So the answer to your question is; you can't level up on your Black Ops splitscreen account because you don't get splitscreen accounts in Black Ops.
Moon
complete the campaign