Baseball cards?

[Dogbert]

It would be easiest if you knew individual players you had and all that.. You can't really tell by what you've said, you may or may not have anything worth much at all.

Even some of the best players cards aren't worth much money, it mostly depends on the brand of the cards (anything other than Topps isn't really worth it, Upperdeck and Bowman (Fleer and Upperdeck are both made by Upperdeck) are okay but not worth while unless it's a great card), the year of the card, condition and that players status in the Sport, etc. Rookie cards are really what you want for the most part.

I am going to assume you don't have really old cards, the most valuable ones, but there are some recent players that can be worth money. I found this link for the Top 20 "Modern Era" baseball cards, Top 20 in value.

I don't really know what to suggest as far as finding any valuable cards in a huge stack. You'll pretty much have to go through them, if you know what you're looking for, or have someone else do it. Or just sell all of them to someone as a risk/reward pile. Someone will be willing to filter through that pile to find any potential good cards.