I would highly recommend you use Easel to cut a couple of test patterns, just to make sure everything’s working and you’re getting accurate results.
After that, here’s some info that might help:
You’ll want to read this thread about how to set up V-Carve so that it has the correct settings to work with your X-Carve - V-Carve Post Processor
You have a couple of popular options for running the gcode that V-Carve will produce. One of them is “Universal Gcode Sender”, and you can find some info about it here
Another popular option is Chilipeppr, at ChiliPeppr - Hardware Fiddle. You can proably find some youtube tutorials to help you out with it.