“I’m a day trader and i currently only have one monitor set up but i would like to have 2, 3 or even four monitors hooked up to my computer if possible but I have no clue on where to start.”
Matrox DualHead2Go or even the TripleHead2Go which are multi-head monitor devices will allow you to plug in multiple monitors using just one VGA (analog) or DVI (digital) port from your computer. So even if your computer can only support one monitor you can use a TripleHead2Go for up to 3 monitors. You could even buy 2 DualHead2Go and get up to 4 monitors on one system but you would need to video ports to support each box. You can even plug the Matrox onto a laptop and have multi monitor set up that way as well.
Matrox TripleHead2Go
How do I get 2 monitors to stay set up for clone/mirrior
Vista
One of the monitors is a plasma tv