Mmm, Ok...
So, I\'d recommend you to start either with white or grey primer, unless you are going for strictly rank and file minis. There are a lot of excellent painters out there that swear by black primer, but if you are planning on doing salamanders, grey should be the most useful shade.
Basecoat the model with Dark Angels green, then mix about 50/50 of DA green and Striking scorpion green for the medium shade, and apply it to the whole armor, leaving only the recesed lines and panels of the armor the original shade of DA green. At all times, the paint must be watered to the consistency of milk, or you\'ll get a rough working surface, and it\'ll show later on when you proceed to layering.
Then apply highlights of roughly 33/66 DA green and SS green to the parts of the armor that would receive the most light (this will add depht to the armor). You can keep working your way up to pure SS green for the highlights, using as many layers as you want.
Now, the really tricky part: Line highlighting. What you want on SM armor are thin, sharp highlights, usually a mix of your brightest shade on the armor, and white.
You don\'t actually need to draw the highlights with a very thin brush, you can use a medium brush for the job.
What you do is load some paint on your brush, and then touch very gently the edge of the armor with the side of the brush, following the contour. You need to use a small amount of paint, and it must be a little thicker than the consistency you used for the layering, but still watery enough to flow. This might require some practice but it gives great results.
One common error when line highlighting is to apply lines all around an armor piece. This is wrong, and ends up looking as those guys in that TRON flick. DEpending on your model, you\'ll only need to highlight, again, only those parts where light will hit directly, as the upper edge of a marine kneepad.
These are some painted examples:
Space Marine Veteran
And
Marneus Calgar