Your laptop's main method of communicating between a secondary mointor is utilizing it's VGA(a port with alot of holes) port on the left side.
If your monitor supports the blue connector(
VGA), then find a VGA to VGA cable like this
[/b]]one.
If your monitor does not support VGA but supports the white connector(
DVI), either find a converter that does VGA to DVI like this
one and buy a
DVI to DVI cable, or get a cable that does the two things, mentioned above, in one
like this one.
If you want to communicate with a tv, you already have a
hdmi port. Get a cable like this
one.