I am not surprised that there is going to be little familiarity with Computers and even Windows. I would definitely - not start with Ubuntu and forget about Mac

I am not surprised that there is going to be little familiarity with Computers and even Windows. I would definitely - not start with Ubuntu and forget about Mac's. Training will be the hard part. Focus on that and maintenability of equipment. Avoid laptops - they get stolen easily and battery packs fail fairly early. Wishing you good luck!