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for a quick test I'd recommend Easel - see the sticky "first project" thread above!

As a first test Easel is quite nice and easy, here is a test of mine (red foamex is very nice, it covers the blood trail of me trying to fit in the window panels *ouch*). The MicroMill works...

I'd recommend Fusion 360 since there are lot of Youtube tutorials available (on how to use the program itself, not for use with the MicroMill - but the exported g-code works with Grbl Panel)