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What kind of cable I need to buy to watch in my TV what I'm doing on my laptop

My wireless card in my laptop is Intel® PRO/Wireless 3945ABG. Is it work good with Linksys WRT54G? Does Linksys WRT54G has AP and switch? If yes can I do something like that.. connect my modem with router using RJ45 and then connect my network card in my PC with router using one of those 4 left ports (in my network card i have a only one port [for RJ45]) and set up my AP and connect my loptop using wireless connection. I mean can I connect one computer using cable and one using wireless card. Sorry for those stupid questions but I'm newbie and I'm starting with networting.

I got loptop and PC. I got internet on my PC and I want to have internet on my loptop so I have to divide it. I have a modem Speedstream 5100 and it has three sockets (power, enthernet, and phone line). Do I have to buy router, switch, hub or somethin'? What is the best way to divide my internet? I'm newbie ;P