I prime the miniatures with some Trench Brown with a Matt White zenithal highlight.
Trooper White is used to sketch in the insignia on the flags and banners. It's ok if this is rough, zombies painted it, they're not known for their artistry.
Gold details can be given a bit of Verdigris , but I saved this for gold areas rather than details, such as the facemask on the Doomseeker.
This is more a guide I can keep referring back to more than a thing I expect anyone else to actually use :P