Do you have a hobby or craft store nearby? My recommendation would be to buy the paints piecemeal as you need them. I use Polly Scale and Testors Model Master Acryl acrylic paints for all my hobby uses (in addition to railroading, I also paint scale soldiers and fantasy figures). I have about 60 colors, mostly hues of green and brown. I mix them when I need something different that doesn’t come in a commercial color. For some reason, Testors (which also manufactures Polly Scale) doesn’t make a color that looks like blond hair, nor anything that’s a true sky blue, just to name some glaring examples.
If you’re going to mix your own, and you think you ever might want to use that color again, WRITE DOWN THE RECIPE!
While you can buy paint containers at an art or craft store, I prefer to go to a party supply place and get the plastic 1 oz or 1.5 oz dressing or sauce cups with lids. They cost about $0.10 each in quantity, and can be reused a few times before they break. When they do, chuck them and use another.
If you’re going to press for a list, here goes:
– 70% isopropyl alcohol, thinned 50% with distilled or filtered water, to use as a thinner.
– MM Acryl colors: Earth Red and Rust for weathering, Flat Black for washes (thinned 1:10), and Steel for shiny metal objects
– Polly Scale colors: Dirty White (really an ivory), Grimy Black, and Dirt for weathering, Roof Brown is a good color for railroad ties (although some prefer RR Tie Brown).
You can go to the Testors website and see all the color patches (Polly Scale paints are listed under the Floquil line): http://www.testors.com/model_and_hobby Most of these acrylic colors have a similar shade in the MM Enamel or Floquil (enamel) lines, if you prefer higher doses of VOC.
For landscape colors, my layout undercoat is Glidden Nutmeg Brown (available at hardware store