http://www.paintingclinic.com/MainClinic.dwt.htma few quick tips of my own:
Always start with a Black Undercoat, no Black Undercoat = No Shading
Build up the colour from the Undercoat, use at least 2 shades of each colour
Learn to dry-brush, dry-brushing is one of the most useful and effective techniques for highlighting, no matter what some so-called 'pro-painters' will tell you (in fact I've found that most people who dismiss dry brushing as bad technique can't/don't do it properly)
Citadel's 'Delvian Mud Wash' can be very useful for extra shading but don't over use it
Although most people will use Citadel paints they can be quite expensive - Coat d'Arms and Privateer Press's P3 are less costly alternatives and just as good
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~The ravings of a single mad Goblin is bad enough, but such a power-hungry, malice-filled creature as Mortis can never hope to be understood~