Why do you need instructions?
Pick some colours you like and slap 'em on!
There are numerous tutorials on painting various effects (concrete, bone, metal, etc) online. A quick google search should set you up with all you need to know about painting techniques.
You may also be able to find a link to the very
WD article you mention (I would have a look but I am at work).
Also, have a look on the
GW site, as they may have a painting guide for the model there.