Here is a painting guide I found years ago. It is intended as a Quick Painting Guide to get a lot done in a short amount of time. You won't win any painting competitions with it. I would give credit to who ever wrote it but I forgot as I've had it for years on my hard drive. Examples below of my Uruk's using this guide
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Start things off with a hearty drybrush of Scorched Brown over the entire model. Use a large drybrush and just go at it; don't worry about details at this point. Just get a good covering of paint. Next, finish off the bases. Or don't! It's your choice. Personally, I prefer to do the base early on as it simply gets it out of the way.
Okay, enough drybrushing; time to stipple instead. Paint all the metallic areas of the model with a heavy stippling of Bestial Brown. We're talking shields, swords, helmets, gauntlets, leggings, chestplates – everything that's metal! This coat of brown paint will act as a layer of rust/beaten metal. Next, apply a solid coat of Scorched Brown to any wooden handles or bows.
Time to finish up the metallic equipment. Go back over all the Bestial Brown areas you just painted but this time with Boltgun metal. Give the armour, swords, and the like a good stippling of Boltgun Metal. If you want a darker metal, mix in some Chaos Black with your Boltgun Metal. You'll see how the rusting effect comes to life during this step. Be sure to clean you water after using metallic paints, as tiny flecks will remain in the water and spoil future colours. Once the metal is out of the way, finish the wooden parts of your models by highlighting with Dark Flesh.
With a lot of the sloppy brushwork out of the way, it's time to concentrate on tidy brushstrokes. Heavily highlight all the flesh areas with Dark Flesh. As you can see, the earlier Scorched Brown drybrush has done a lot of the work for you. This fact becomes very apparent when you next go over all the leather on the model once more with Scorched Brown. Finish up by painting gloves, belts, straps, and any hair with Chaos Black.
Highlight the skin with a mix of Dark Flesh and Bleached Bone. Start with only a bit of Bleached Bone in your mix, then work your highlights up slowly. With the flesh taken care of, move on to the leather. Grab Scorched Brown and once again mix in some Bleached Bone. With this mix, highlight the edges and rises of the Uruk-hai garb. To complete your basic Uruk-hai, mix together a bit of Codex Grey with Chaos Black and highlight the edges of all the black leather and any strands of hair on un-helmeted Uruks.
At this point, you can add a few finishing touches to your models if you wish. Gore spatter can be accomplished by layering Blood Red and Chaos Black followed by Blood Red onto weapons, faces, and armour. Another easy detail that adds character is The White Hand of Isengard. You can accomplish this symbol easily by slathering vaguely hand-shaped Skull White icons on faces, shields, chests, or wherever. Finally, you can pick out teeth with Bleached Bone or a dingier colour – after all, Uruk-hai aren't known for their oral hygiene. So there you have it: six easy steps that get your Uruk-hai force looking good in but a few evenings of painting.
Hope that helps!