In my march to CNC ownership again, I want to get familiar with the software. As far as I can tell, software falls into 4 camps; CAD, CAM, Controller, and Integrated CAD/CAM. Design is done in CAD. CAM converts to gcodes. The controller sends it to the machine. Correct me if I am wrong here.

Now, my intention is to do relief type work (3D needed) and cut shapes. The machine likely will be a Joe's hybrid. Wood, plastic, and non-ferrous metals will be the mediums.

For hobbyist stuff (well, stuff will sell, just not in huge amounts), which tutorials would you be looking at if you were in my shoes? Best bang for the buck?