Forum:New to CODMW2 XBOX

My husband recently got CODMW2 for XBOX 360. He is playing live and is level 56. But there are a lot of things he is unsure of. We have looked everywhere for a guide but can't find anything online or in the shops. If you haven't played any of the previous COD titles you are stuffed as they assume you know what you are doing. I have just joined this site so I am hoping to find info on here but if anyone knows of any other good guides I would really appreciate it.