To send the video signal alone to the TV, you need a standard HDMI male-to-male cable of the appropriate length and a mini-Displayport to HDMI adapter such as this:
http://www.monoprice.com/products/search.asp?keyword=5311&x=0&y=0
To send audio to the TV separately from video, you will need either a mini-TOSlink to TOSlink digital audio cable (if the TV has a TOSlink input) or a 3.5mm stereo headphone plug to 2 RCA plugs analog audio cable. Either can be found at any Radio Shack, Best Buy, etc.
To send 2-channel stereo audio plus video to the TV set via a single HDMI cable, you need an adapter like this plus a standard HDMI cable as above:
http://www.monoprice.com/products/product.asp?cid=104&cp_id=10428&cs_id=1042802&pid=5969&seq=1&format=2
And to send 5.1-channel surround sound plus video to the TV in a single MDMI cable, buy this adapter and a standard HDMI cable:
http://kanexlive.com/products/item.aspx?id=3495
Read your TV set's manual to see whether there is a particular HDMI input port you should use when connecting it to a computer, and for any other applicable instructions on setting it up.