Hi, Welcome to the forum.
You might try painting after you try an airbrush later
As for a new airbrush, you must decide if you want a bottom feed/siphon feed or a gravity feed/top feed airbrush, then how fine the details you want to paint on the stock, this will help you decide which nozzle size perhaps you want to go with.
What paint will you be using? If on woodstock, a good preparation of the surface is necessary and you will learn all this here. Do not hesitate to ask any question.
Ah, and for the airbrush, i would have bought a Neo for Iwata..an entry level airbrush, very capable of great details once mastered and of course with the 5 years warranty put on the balance with its price tag, there is not better entry airbrush...IMHO
but others may chimes in and direct you to a better, cheaper product.
Good luck in your quest and don't forget to have fun...it's only paint