Would you be willing to answer a few brief questions about PlayStation Forums?
You will need a router with Verizon or Cablevision. It is simple as all hell to set up. Go buy a Linksys router and come back for directions, pm me and I will walk you through setting up the router to your PS3/Computer etc.
if anything you can buy something like this, plug it in the back of your modem and viola! you have wifi
If you just get a Wifi router, the router plugs into where the PS3 is plugged in and then the PS3 plugs into the router. The Vita connects via Wifi.