Meh you'll be just fine. That's the same exact air brush I got, the Pasche single action. Its a great I love it. I also started airbrushing with it also, very user friendly.
Just practice with it on some cheap boxcars or something first. What kind of air compressor did you get? You have to play around with the air compressor until you get the perfect amount of paint coming out of the brush. But once its dialed in, no need to adjust it.
Post up some pics when you paint the well cars.