CAM software to Controller compatability

I am in the early stages of putting together a cnc tangential knife
cutter
So far I just ordered linear bearings and holders that I found surplus
in the US. I am looking at a CNC system that is offered by a CNC
retrofit company in Woolongong. They have a developed a servo
controller that runs on step and direction signals. This seems an
afordable way for me to go at present. Though If I really knew my
electronics - which I don't, and thats the problem - I would try for
some more surplus gear that seems relatively cheap for
this backyard builder.
Thanks to all who helped with my enquirees on software
for running a tangential blade machine I am building I have a good
start I think with DANCAM as a free start and Professional sign making
software to look at for serious work. So, I can get my head around
most aspects af the cnc machine but am pretty hazy re issues around
the compatability of cam software, machine software, controllers servo
amps and motors. For instance Cadlink Profilre lab outputs in HPGL
direct controllers? So you need controlers that understand HPGL
as opposed to G Code? Ideally I would like to start trialing my
machine with the old DANCAM shareware which I already have and then
upgrade to professional software when my machine is working and will
be ready to generate some income for me. But again I am concerned
about compatability problems. If any one can help to clear the air on
this area or point me in the direction of some tech info site or
something like 'CNC for Dummies' !
I would be most grateful.

Regards,

Peter Uhd