Need help for my painting scheme

So I’ve decided that I want to do my gsc in the style of the alien movies. I know what to do for the pure strain genestealers, the patriarch, the acolyte hybrids, and hybrid metamorphs but I don’t know what to do for the rest mainly the humanoid ones (neophyte, primus, etc.) and the vehicles. This is my first time really painting and I could really use some advice!