You are probably right to try to keep it simple! I started around 5 years ago and tried to use freeware CAM packages. They might well have improved in that time, but I did find them limited and problematic to use. I did some useful work with them, but was always fighting rather than working with them. I moved to Vectric VCarve and never looked back. It's not cheap, but Vectric have worked hard at making the interface and the options as easy to use as reasonably possible. A lot of people recommend Cambam, but I haven't used it myself. Good luck with Dolphin - again, not one that I have used. The trouble with CAM is that there are usually a lot of options and parameters to tweak, until you eventually figure out the ones that you can ignore and leave as default, while you just change the ones that matter. Good luck!