There is a good youtube video you can watch for set up and calibrate for Vinyl Master. These software companies have many videos and instructions out there to walk you thru just about anything. It's not that hard to do searches online for what you need. How to calibrate in Vinyl Master.
You should see width in 1 box and length in another. Put some sizes in the boxes. MY demo already shows sizes. Then use the TEST CUT to cut it. You don't want a real big box... Measure the cut , is it the correct measurements as in the boxes? That is what your wanting to do.