I can tell you right now unless they are real, real old or rare cards, they are probably not worth much at all, maybe $10 tops for a card. Always keep them in great shape though....
wow...this guy has no idea what he is talking about go to beckett.com subscriptions are not expensive...or go on ebay do a search for the item in question and click on completed items in the last 90 days....this way you will be able to find a trrue market value for the cards...or check out thepit.com....they offer certain rookie cards as stock and you can get some prices there as welll