You can chose the colors you want but i suggest yellow and blue. Why yellow and blue?

Simple because yellow and blue gives green.

I'm suggesting to paint trees.

You pick up you larger paintbrush and don't forget, first you wet the paintbrush in the oil after you mix it with ink...that is why oil ink because it mixes with oil.

You can paint the surface of you canvas in yellow, after you can put one drop of blue depending the tonality and paint stacato, oil don't dry it mixes the yellow with the blue, you paint the trees and after you use black and white for the lumber in the vertical way with a small paint brush. 

It will come out like this: