Do you trace it on computer with a mouse or on a tablet with a pen?
I do it on a computer with the mouse. If your CNC system will import a dxf file, I recommend that you pick up a copy of CorelDraw. Versions a couple of years old can be found on eBay at reasonable prices. In doing my bikes, manually tracing the lines precisely would be almost an impossibility. With CorelDraw, you can do almost anything once you learn to use the node editing tools. You can easily follow a curved line with any contour exactly by manipulating two or three nodes. I can't begin to list all its functionality.
If you are just doing simpler stuff, like cutting brackets, you probably don't need the same capability. Learn how to use CorelDraw, and the sky's the limit. Your CNC software must be able to handle the standard tasks, such as automatically cutting inside shapes first, compensating for the kerf, cutting holes and other internal shapes counter-clockwise and external shapes clockwise, etc.
Here's another one I did today. This involved planning and drawing it, cutting it out, cleaning off the dross, prepping for paint, and painting. This is an early Harley XR-750 flat tracker.
