Actually Ive been using cards for my games for years every since the Tecmo superbowl days, lol... Actually, Its cool seeing a variation of what I do posted here....I use card decks for a lot of different things, I started out using decks for playcalling then it evolved into basically everything....signing free agents, trades, etc...Just set it up the way you feel would bring enjoyment to you is the only advice I can give.
..which isnt very much advice. F-U-N is the name of the game...Peace!