Jimmy, you have to give us more clues here.
As this link shows, the problem can be one of a few things.
5 Ways to Diagnose a Non Working Air Conditioning in a Car
It can be as simple as needing a charge, or bad as a shot compressor, evaporator or condenser. Nothing unique about the Versa AC system as all car AC systems are virtually identical. As far as cost, it depends on what is wrong.