Thanks Ger21 for the Mach3 help.
As far as the size of material, Vcarve has a setting for that, when you run the "open" sign (sample) in Vcarve, you can adjust the size of material like this:
1) Open Vcarve
2) select the "
Open_Sign.crv" (sample)
3) click on "Edit" (at the left, top of the page)
4) in the dropdown, select "
Material Size"
You can adjust the size of material
1) Width (X)
2) Height (Y)
3) Material Thickness
4) XY Origin Position (starting point, thats your X=0.0 , Y=0.0 of your material)
So in Vcarve, If I set my "XY Origin Position" to the top left hand corner, then I would set Mach3 at X=0.0 , Y=0.0 at the top left hand corner of my actual material that I'm cutting.
Note:
The photo below has the "XY Origin Position" set for the center of the material, I would suggest that you start with the "Open Sign" in your demo of Vcarve, that way you can adjust material size & your cutting tool that you will use. Remember to save the post processor as "
Mach2/3(inch)(*.txt)".
I would suggest that you run the cnc machine with no material on your first cycle, just cut air! That way you don't crash your machine. Some guys will put a marker/ink-pen in the cnc instead of a spindle for the first practice run.
Crashing a machine isn't fun! 
.