It would be hard to say how much your football cards are worth because I'm having a problem seeing them from here! You might want to look them up individually on the internet or take them to a sports memorabilia store and see if they can give you a price on your entire collection.
To find out how much football cards are worth you can purchase a card pricing magazine. This magazine is published monthly. It is a way to find out the worth of your football cards. You can find more information here: http://beta.beckett.com/