Welcome to DMS!
The Zing runs as if it were a printer. It only “prints” pdf vector files and it doesn’t use RDWorks.
In other words, you need to create a vector file using some vector program - Inkscape or Adobe Illustrator - and then do a Save As to a vectorized pdf file. If you do that from Illustrator then the pdf file will be the right format. Note that I’m emphasizing a vectorized pdf file. A pdf document file isn’t going to work.
You really need “Laser 102: Zing Basics. Required class to use the Epilog Zing laser. Covers Inkscape, creating compatible PDF file, laser safety, and using the Epilog Zing.” Unfortunately, I don’t see that on the calendar. @Talkers … are you the Zing instructor?
When you stroke your vectors in Inkscape or Illustrator, they should be 0.001" thick or it will interpret them as rasters. The strokes need to be primary colors (any color with either #00 or #ff as the hex portion of each RG and B). If you use Illustrator, you need to set your file color mode to RGB. It defaults to CMYK and then the laser will interpret all your colors as black, despite the fact that they look like red or whatever to you.
As an aside, I have a personal suggestion. Determine some color coding scheme for yourself and always use it for the order in which you make your cuts. I use “RGB” 'cuz it’s easy for me to remember that order. Red is always the first color I “cut” - and in my case that’s always a vector engraving layer - so I stroke all vector engraving objects with red in my design file. If I don’t have an engraving layer, I just skip red completely. Green is “intermediate” (i.e., non-perimeter) cuts and that’s second. Blue is my perimeter cuts and that’s the final layer when my stock gets separated from the workpiece. Using this type of scheme (or whatever works for you) ensures that you can go back to a file much later and still reconstruct the order of your cuts.