You need to know what type of video output you have on your laptop. VGA, HDMI, MINI DISPLAY PORT. You need to get a monitor that can use the same port as your laptop.
Usually a laptop can only output video for one additional monitor.
You would need an external graphics processing unit, GPU. They are now available. They can also power multiple monitors. That would most likely what you would need. You can use it in addition to your one output by your laptop also, if your laptop manufacture allows. So even more monitors.
Do some research on ext gpu or video adapters.