Haven't bought an airbrush for years...40 I guess, don't have a spray booth, clean the two airbrushes I have now once every two years, don't lay any paper, didn't practice, haven't replaced anything except the nozzle tip for one of the airbrushes and one new hose, don't wear a mask or protective eye goggles...just my reading glasses and underwear during heatwaves and solved any airbrush issues on my own because the working parts are just plain generic and logical.
My first starting airbrush was the Humbrol single action suction piece that looked like a mini insect pump spray with no adjustments available. You either spray close up for smaller diameters or away for larger coverage. I learnt how to regulate air pressure with my finger tip depressing the lever ever so gently. air was from a can that lasted only minutes...longer if you knew how to save on cleaning.
The moment I bought it and headed home it was straight to the bench, short read on instructions and away I went. Luckily they gave two cans of air and the first was exhausted with all that investigating...pressure, distance, width gauge of spray pattern and finding out that anything that blocks the spray from the surface is a masking. My first victim was a Monogram P-47 ala Gabreski camo and D-Day stripes. It was a success. I was 19. I'm guessing when you're younger curiosity does gets results quicker. The rest of the time it just became another tool for easy painting.
If I were you I'd suggest to just get stuck in and have no fear. You'll only be expanding air and paint while on the learning curve.
Cheers,
Wabble