I am by no means an airbrush expert but I can give you a few tips.
A DA airbrush is not better but just allows you to control the width of the paint during your stroke, narrow to wide or wide to narrow. I have a DA Paasche VL and have only ever used it for modelling in single action. I also use a #5 needle which gives the broadest width.
A gavity feed will allow for greater detail, meaning really fine lines; and a siphon feed allows for easy color changes because the bottles are attached to the bottom of the airbrush. Just remove one color bottle run a bit of thinner through and swap in a new color. Again my airbrush is a siphnon feed.
Regulators are very important, I use a 5 gallon compressor and shoot between 15-20 psi. Its not so much varying the pressure but controlling it and have it stay at a constant rate.
My airbrush is 26 yrs old so I can't really comment on trigger types although its a push button type.
You will need plenty of ventilation for your apartment to exhaust the paint fumes and mist or you will wind up painting in a cloud of paint, also you will need a descent mask not one of those disposable paper ones.