Most of the airbrush work in pinball restoration is dumping paint uniformly (and lightly!) onto a masked area. So I am not sure the quality of the airbrush is that important. I have been using a 0.5mm needle size since I am primarily trying to get even light coverage over a masked area.
I use an Iwata that I bought in a kit: https://www.iwata-airbrush.com/airbrush-sets-kits.html
As for paint, many people swear by Createx paint. I am using Golden High Flow due to the variety of colours and their online Golden Color Mixer.