Maggie,
What machines are you using for EMB and cutting? My machines have a scissor icon that sends the cut file to the USB. Take the USB to SNC for cutting. There are converter programs available also.
The tutorials that I have watched show to increase the cut file by one or two clicks of the plus sign.
Check the LQS for classes or the internet for machine specific tutorials. Practice on some sample pieces until you get the cut settings and sizes right.
I'll follow your thread as it is my goal to learn this technique also. Good luck!