How do you get credits to unlock stuff in Battlefield Bad company?

I bought BBC on sunday. Have played around 3-4 hours so far in multiplayer (mostly unranked games) but haven't unlocked anything (like new weapons) so far. How do you earn credits to unlock stuff?How do you get credits to unlock stuff in Battlefield Bad company?
You need to play ranked games. Each rank you go up you get 1 credit. All locked weapons cost 1 credit. I unlocked all of them i am rank 25. That game is fun!How do you get credits to unlock stuff in Battlefield Bad company?
I have all the codes to get all weapons email me if interested

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How do you get credits to unlock stuff in Battlefield Bad company?
to get those credits you have to play ranked matches to get experience so you can level up. most of the time its every two level ups to a credit. you then can go to the unlock screen and choose you preferred equipment
you have to play ranked games and rank up