Could you recommend a few basic colors?.........I know from snooping the website that the color names bear little relation to the actual color (lol)
You are right about that! Your WNW J.1 kit will give you the Tamiya color call outs for the main finish colors. I
love Tamiya acrylic paints although you will note that most people here consider them unusable unless sprayed. (I find otherwise but I seem to be in a distinct minority in this regard.). As for Citadel metallic colors, they recently reworked their entire range, but I found these colors useful:
Ironbreaker (darkish silver)
Runefang steel (decent aluminum color)
Auric Armour (brass color)
Hashut Copper (copper)
Runelord Brass (another brass)
Also, as a detail wash:
Nuln oil
Reikland fleshshade (Good wash for leather effects)