Victrix big banner tips

I'm painting it tomorrow for march! I know I'm late but there is still time to march for macragge. Anyway, my plan is to:

1. Prime the actual body in black

2. Prime the banned white (so I can do contrast for the marine and nid on it)

[I have fully assembled the model too]

3. paint the body blue

4. bla bla bla

anyone got any tips? :)