Try reading the painting and modeling articles on the gamesworkshop site, but try not to trust them too much as they tend to lie somewhat on which paints they use (in my opinion). And I'm really not trying to patronise here, but google is a godsend. There are alot of talented people on the internet, and some of them are kind enough to share their secrets.
Just keep in mind that everyone has their own method, and you will quickly learn what yours is, and how to take the bits that suit you out of tutorials. I mean, I could teach you how I paint my stuff, but you probably wouldn't like it, but you may like some of it.
hope that helps, probably doesn't though, sorry.
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