John you need some kind of design (CAD) software to draw the design and then you will need a CAM program to output the gcode to cut the project.
There are combination programs that do both CAD and CAM.
Fusion 360 is free and is CAM/CAD so you can do it all but it does have a large learning curve.
For hobby use, I recommend Vectric software and start with Cut 2D and as your needs grow you can upgrade to VCarve or aspire for the difference in the price of the two. Of course you do have to pay for these.
You also need a control program for your CNC machine. What control program does your CXNC use?
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