Repainting help

Hello all, new to the forums here and new to repainting transformers figures. I want to repaint a couple of acid storm seekers into skywarp and thundercracker respectively (primarily because of the expense of these figures) and was wondering where to start.
I'm already familiar with painting (I play Warhammer so I know a lot about painting, particular fine detail) but I was wondering what kind of primer (if any) paints etc worked best on this type of model seeing as how most of my mini's are resin, or metal.
Any help would be much appreciated, thanks in advance.
I'm already familiar with painting (I play Warhammer so I know a lot about painting, particular fine detail) but I was wondering what kind of primer (if any) paints etc worked best on this type of model seeing as how most of my mini's are resin, or metal.
Any help would be much appreciated, thanks in advance.