Just started using the hockey ultimate team and i played a few games now i can't play a game because some of my guys need those game cards or whatever. Where do i get those?
they need contract cards. You can buy consumable packs, or you can search in trading for contracts
Every card pack you purchase with either MS points or EA pucks will have some contracts in there. Ranging from 8 games to even 80 games if you get lucky.
Or you can search for them and bid on them....or trade with someone for them