you have to level up by playing games online. More powerful perks are available the higher level you go
you just do. OKAAY? Kay :)
to use perks in call of duty u just set up your class with the perks you want and you will automatically be using them, perks or not activated they are continuous.
About 11...
8
Perks are Things that Help You on Your Game
you have to buy them. you cant 'unlock'
Yes you can unlock extra perks on call of duty four but you have to be playing on live and gain ranks. to do this you must win round with 1 or more kills.
yeah
15+pro perks if I'm not mistaken
you have to just play the game. Once you rank up you will unlock new perks and weapons. I don't know exactly when but you will eventually.
You unlock it after reaching a certain level.
You have to be online, and the only way to unlock guns is to level up. Just keep leveling up and you will start unlocking guns, perks and new challenges.