My advice would be to meet with them and ask the about their expectations from you in terms of what to supply and in what format. If you had a CabWriter design, I would show it to them and explain what features you’ll be cutting with the CNC, then export the DXF’s for the design and have them take a look at it.
I did exactly this with a friend of mine who own’s a large Biesse CNC at his shop. I supplied him with the DXF files; he nested and created tool paths for the sheets. Then, we simulated running the parts by keeping the tool above the sheet before running it for real to make sure that it was doing what I thought it would for each sheet. We did this the first time; after that, I trusted it and we just ran the parts. No problems at all.
Hope this helped a little…