Welcome to Librarium Online!
Ok, my friend needs to paint hes orks in 6 days to compete in the winter war campagin. hes getting:
ogre bulls (HQ)
hes an ork painter so faster then average right? adivse me on
ps hes got 6 days for as long untill the job is done
Pss dont give me bad rep for this post he told me to write it (narkotic)
Dark Angels Green Spray is NOT your friend. Chaos Black Spray is.
Spray it with CB, then drybrush the skin with Catachan Green+Dark Angels Green mix(About 50/50). Ink that over with Dark Green Ink then give it a very(VERY!) light drybrush of Catachan Green. Super fast Ork skin.
For the guns, just Boltgun Metal(Or, if you can find it in a hobby store, Gunmetal Grey.) and Chainmail highlights. Very fast, very easy. You could add some quick rust to it though by adding small blotches of Fiery Orange and then brush the edges of the rust with Chainmail again. It works perfectly.
Other people will have other stuff to say about Ork skin, but my palette works best for me. Hopefully, it will look good to your friend.
for the wartrukk base the whole thing black, then dry brush with boltgun metal followed with highlights of chain mail, topped with mithril silver. add in the main coloring of the arme theme on the front part of the trukk or when all else fails paint it red on the front. add some spikes on the spokes of the wheels.
for the bulls make sure they are a little darker than the regular bulls since bigger orks are darker. teh grots should be the lightest of the bunch. make sure he uses the circular bases for the boyz from fantasy or he'll have to go buy more their cheap but some players are sticklers on them.
40K-Beakies(9-14-4),Guard(4-7-2),Orks(34-12-11). FANTASY-Dwarves(15-6-7),Beasts (14-14-1), Skaven (17-17-10) DoC (6-1-2). CYGNAR (28-15-1)
Dump a vat of green over their heads.
Walk into the store and claim gork's been sick over his army ^_^
Probably not the most helpful advice, though... recruit help. If he's building a half decently sized force, and wants them to look half decent, he'll need it.