There are tons of hobby products out there for weathering and customizing models. Where to start? Here, I show you what I started with to learn the art of N scale railcar weathering.
A few recommendations:
Com-Art paints are hard to find. Go for Vallejo
ArtChunky charcoals (not chalks) are what I used for weathering.
I'd recommend my Iwata Eclipse airbrush hands-down. Pricey but fantastic.