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DavidI recommend that you buy from amazon or your local bookstore a copy of SCD's Standard Catalog of Baseball cards (Krause Publications). This is particularly true if you have a collection of cards.
Excepts for that the size you stated size is goofy, it sounds as if you have a c. 1909 T206 'White Borders.' The value is dependant on condition, so the information you provided is incomplete. I can, however, tell you that a common T206 card, like yours, won't make you rich, but will be worth a few bucks at least (again, depending on condition) and, more important than monetary value, is a from a famous and popular set.