Depends on the monitor. You can get HDMI to DVI or HDMI to VGA cables but it depends on which the monitor uses. HDMI connector would enable you to use a HD TV as a monitor although that might be more annoying than the netbook screen. Dh says if you google DVI and VGA images it'll be clear which one your monitor has. HTH.
You get a monitor wire and connect it it's not at all complicated I can do it then you toggle a key on the laptop that usually looks like a laptop to screen (on mine it's a function key you press FN to get it) and it goes to the big screen.
There's a cable point on the side of my netbook with about 12 teeny holes in it - you need that it's usually a blue connection with two pegs on each side and you connect it to the laptop and other end goes to the screen. Amazon do them.