I highly recommend checking out the sites below!
http://www.sportscardwebsites.com/ - An excellent site to learn more about baseball card collecting and trading
www.dcssportscards.com : Find the best deals on everything baseball here.
www.bargainbaseballcards.com : The best place to find links to baseball sites.
www.bbcemporium.com- Great place to buy or sell your baseball cards.