Who supplies the Post Processor?

Alrighty folks, so I took the plunge and I have purchased a Taig CNC
ready mill that was on ebay. I am planning on getting the DeskCNC
servo kit for this machine (is that a bad idea?).
What I'm really wondering about here is how do I go about using a
program like GibbsCAM, which I have access to, to output code for
this setup? Im not terribly well acquianted with GibbsCAM, but I
think I need some sort of post processor to run the code through
before I send it to the machine with the DeskCNC software.
Should the DeskCNC folks supply such a post processor? Or should I
look to the GibbsCAM people? Or will this be impossible?

Thanks,
Andrew Pullin