I wish that we had a collectible card expert on this site. But unfortunately for right now, we don't. These kinds of questions come up fairly frequently here. You might want to put the two words, "baseball cards" in the search option at the top of this page to questions that have been similar to yours.
Also, when looking for the value of collectible cards, please keep in mind that the condition of the cards makes a huge difference in how much they might be worth. Card collectors get really picky about the conditions of the cards when determining a possible value for them. So, it really would be best if an expert could be viewing the card or cards in person.
Other resources that you might want to try would be a store that sells collectible cards, a bookstore that has books on collectible cards and also, a public library.
Here are also some other links that might be helpful to you:
Baseball Card | Value Price Guide | Selling Cards Worth Baseball Card Value Price Guide based on prices realized in auctions. Email alerts on pending eBay auctions at no cost to you. Basketball, Football, Hockey and Boxing Card Price Guide. Track Card Values like a Stock Portfolio. VintageCardPrices.com
If you put the term baseball card into the search function of this site at the top of this page, you will find a lot of links that also have answers on them as to how to find the value of a baseball card. There are also links on the bottom of this page to questions that have been similar to yours.
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