Those are great questions, aboB. You've got a good tool there, one of the better ones. Good choice.
As far as Testor's paints, any type of enamel model paint is great for these things. Thinning may have to be done sometimes, and this with a solution suited to the basing of the paint(ie; water for water based). It's better to use Testor's own thinner for their paints as they are formulated for each other. Clean-up afterwards of the brush is very important. Take it all apart and follow the manufacturer's advice.
As with any type of petroleum based, chemical-laden product, it's a good idea if you don't have a booth arrangement to spray outside out of the wind. Many airbrushers/hobbyists have smaller spraybooths in their "hobby room" with fans that pull all the bad stuff to the outside. I would certainly advise anyone to use a mask and any appropriate safety equipage when using these paints, as the nature of the airbrush creates particulates that are easily inhaled or aspirated. I'm a bad boy, and rarely use a mask. "Do as I say, not as I do." 
I mainly use acrylics, which I have MANY tubes of that I get at WallyWorld for about 44 cents US. It's water-based and makes for easy clean-up. I use these for painting toy soldiers and their buildings. I will most likely go with enamels for my Fett project.
