My answers and opinions,
1) compressor, what do you need? Does it matter how quiet that it need to be? You do need a reserve of air to continually paint.
2) paint, TU has a sponsor that has very good prices. I buy from Jannsnet at times. I use wicked now, tuning out createx brand. Auto Air for a sealer/primer.
3) blanks, again TU has sponsors. Jannsnet has some Dakotalakes has them. It is a preference to each person in my opinion. But others will give you some other good places. Actually some have their own blanks. I'm going to get with one and get some from him soon. There is a lot wrote about brand name blanks and knock offs and can be found by a search. I am now make my own blanks (wood). I find it more challenging although I still paint plastics.
4) taping bills, I have in the past, just put tap across (perpendicular to the) nose of the bait. Now I take time to wrap the bait.
5) clear coat, I'm switching to another coating. I wanted to get with Ben before I do. So I'm neutral about this for the time being.
6) stencils, Yes indeed, I enjoy making them, whether the stencil is a half profile type or a lay in place type.
It's the challenge of being a good craftsman and artist for me. It's also a hobby at this time, making cranks. However I enjoy doing them.
Take Care,
Dale