The top selling Baseball card would be a card that is popular, and in high demand, plenty on the market, and would most likely have a relatively low value. You would need to go on eBay to find out this information. This would be the card that is listed, and sold the most. If you mean "what is the most expensive baseball card?" see Related Questions below for the answer.
Yu-Gi-Oh!, record of the top selling trading card game by Guinness World Records.
WikiAnswers is a source of information, and not a forum for selling baseball cards. eBay would be your best place for getting an offer from a collector, and selling the card.
Baseball Card ValueI'm not sure what you mean by the "history" of baseball card values. Value is based on the selling price of recently closed auctions and sales. The recent history of these sales is gathered and averaged out to come up with an estimated value.
New York Yankees, Toronto Blue Jays, San Francisco Giants, and Detroit Tigers are the top selling Major League Baseball Teams. Others are Boston Red Sox and Los Angeles Dodgers.
On-Line AuctionsTo get top dollar for a baseball card you would have to sell it to a collector and not a dealer. A dealer will only give you about half the market value, more or less depending on how long the dealer feels it will take to resell. There is a large community of collectors on eBay looking to buy baseball cards. If the card you have is expensive you might consider selling it through a private auction house such as Heritage Auction (ha.com) or Robert Edwards Auctions.
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a baseball card collector can often find old baseball cards at a garage saleOr you can go to www.tradingcardsetc.com for some of the rarest and best deals online!I would recommend searching your local Craigslist for ads of people selling vintage cards. You can get some real steals there.