MD, wiring diagram here:
http://www.comcast.com/Media/1-2/CM/...ng_diagram.pdf
You will need a DVI/HDMI cable (not supplied with the box) and a set of RCA audio cables (supplied with the box). No rush to get them though. The supplied component cables should work for now but with lesser picture quality.
When the cable guy sets up your box make sure he sets the box HD output to 1080i to match your TV's native resolution. Don't know what the default is for that particular box but it may be 720p which will work but won't be optimal.