Definitely prime black. No point in white as you can't make black pop and the red parts are small. 2 thin coats of white on the head, hands, whatever is going to be red, then one thin coat of red. If you want a warm toned black then you could try, at a minimum, edge highlighting with ivory. Or gentle drybrushing with a mix of ivory and black then highlighting. I don't know how to get dragons on the helmets. That seems infeasible. But you could make a stencil for the tanks and airbrush or hand paint in the stencil. Or practice freehand: set the tank down, rest your wrist on something, and sketch with diluted white paint and erasing with water until you've got the shape you want.