Lots of good info here. In this thread by peopke who know what they are talking about.
Painting is an art. Rattle cans are the best way to start. Then move on to an airbrush if you want to do more advanced techniques. With airbryshes there is so nu c h mire to master. Paint to thinner ratios, which size nozzle to use depending on, what psi to use. Rattle allow you to focus on just getting the paint applied evenly and without runs. As others have said its all practice, , practice,practice.