@Hughes
Welcome to wargaming ! I love DBA, there's an incredible depth to the rules and a lot of fun to be had
One of the great things about DBA is that is doesn't commit you into buying huge armies, so there are lots of opportunities to try out different things, like different ways of painting, so don't stress out about getting everything perfect the first time around
The primer depends on your painting style. Acrylics (hobby paints, Citadel, Vallejo etc) are always slightly transparent
White primer
- end up with brightest colors
Black primer
- more forgiving of mistakes, as any small things you forget will be dark
Any other color is very much an opinion. If the army is mostly one color, that's a good color to use. If you are buying spray cans, I would stick to black and white, although the Citadel contrast paints seems to do better with an off white
The most important thing is for primer to go on very thin so that it doesn't hide detail. With a rattle can, I always spray a little on a piece of paper first, just to check that I can control the amount of paint coming out
My personal style is always evolving, but for 15mm I like
- prime white
- paint mail black (very thin) and dry brush silver
- paint flesh
- use bold, bright colors
- use washes to fill in detail, which will also make the colors a little less bright
Good luck
John