I just started the CNC world mid-summer. I would say the best way to get familiar with the software and machine was making things for your machine and setup. Wasteboards, jigs, laptop holder, bit organizer and all that. I thought 3D carves would be the bee knees. After a few I found that it’s more of just getting the file and hitting play unless you are actually designing your own 3d models (which would up the fun).
I have been playing with some “artistic” tests such as
trying to test some find interesting ways to use the machine.
Play with the machine, think out side the box and most of all have fun.