If you check around at sites like autobody101, autobodystore, or hotrodders you should be able to find a lot of info.
You definitely need good ventilation as clear coats kick up a lot of fog. Also need really good lighting and a supplied fresh air system for breathing.
I have a GW 3/8 flex head 120xp ratchet and it is my favorite, even more so than my Mac and Craftmans. The quality is good but I don't know about durability as I have only had it for a few months.
I have a couple of 1/2 GW deep sockets and they seem to be good but until I use them on some really...
I keep mine charged with the valve closed and switch off.
However, I have been told that leaving the tank under pressure accelerates rusting in the tank as there is more oxygen and moisture in the tank. I had one old compressor that must of been 25 years old that I rarely drained nor let it...