All good practices. I am not finishing these with any kind of urethane or glossy coating, It is just your basic deck stain, so I am not overly concerned with a few dust particles infiltrating my operation. But, I did blow them off with the air compressor as Josh suggested and did notice it blowing away a layer of dust when I did so.
I just did the 4 serving tray handles so far. I want to do them and see how everything turns out. I did also use a combo of the orbital sander and hand sanding as well as both 150 and 240 grit paper. I may try to work a way to stain these indoors. I will keep you posted.