To unlock extra classes you must prestige. In order to prestige, you need to level up 50 times and press "Prestige Mode" in player card. When u prestige once u unlock one extra class and prestige thrice (3times) u unlock another and prestige 5-7-9 and so on until all r unlock
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go to crate classs then go to whatever class you want press a when you pick it then go to name class
go to create a class once you are a high enough level equip it as your secondary weapon
You may create your own class in call of duty, by entering the main menu of Call of Duty 4 Multiplayer. Then you click the title showing 'create a class'.
Call of Duty Black Ops is rated M for Mature.