Step 1: Painting White
Add a dark grey base coat using Mechanics Grey. Vallejo thinner works fine with it.
Using Vallejo white and Vallejo thinner, add a spot highlight a the top of the pad, or on whichever part of the pad is closest to the light source.
Marines were painted predominately with Mephiston red thinned with Vallejo thinner. At this stage you can see the colors achieves by layering Mephiston. A tiny bit of Evil Sunz Scarlet was used to edge a few of the plates. Sons of Orar are dark, not vibrant red. This will be toned down with oils and washes.
This Zombie marine suffered the result of Vallejo matte varnish. The blue tint of the varnish really deadened the paint job. Some other varnish should be used. I have no idea what to use at this point, but Vallejo is out for red!
Two oil pin washes were used, dark yellow for the white areas and dark brown around each armor plate.
Chipping effects on tanks and vehicles are easy to apply with wild rider red and german black brown. I usually apply the highlight color first and then add the chip on top of it.
Wheels and any rubber parts like road wheels should be painted dark rubber rather than black or brown.
Slightly better photos
Pre-Shading Bikes (this can save some coats of mephiston red)