In xbox live (i'm a newbie)- asks me to download maps for the game. It also

You will not be charged for the maps unless you are redirected to a page where it asks you to put in some sort of credit card number or code for microsoft points. You should be good to just go ahead and download them without any kind of risk as long as you don't have any number of idle microsoft points on your account that you could accidently spend without knowing.
 
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