Tutorials:
http://s89202096.onlinehome.us/-Very nice tutorials in general. A great place to start.
http://www.fichtenfoo.com/02GiantRobots/02c.htm-Great tutorials for specific things. The spraybooth and lense tutorials I found especially handy.
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For Painting:
Scherazade wrote:
As for what paint to use, it's a pretty long answer. There are basically three types of paint you want to pick between to paint a kit: enamel, acrylic, and laquer.
Enamel paint is probably your best bet. It's easy to find, easy to use and gives good results [depending on skill, I guess]. Enamel requires a thinner made for enamel paint. Mineral spirits will also thin enamel paint. You always want to thin your paint before putting it on a kit regardless of whether you're handbrushing or airbrushing. Enamels are good for either style of brushing. It dries a slower than acrylic so it hides brush strokes better. Once it dries, it doesn't chip as badly as acrylic paint [a top coat will make it even stronger].
Acrylic paint is pretty readily available, but I don't like using it unless it's absolutely necessary. Acrylic paint can be thinned with water or rubbing alcohol. Testors makes an acrylic thinner and an acrylic cleaner, but it's basically rubbing alcohol in a smaller bottle. Anyway, I would not use this type of paint very much, it's not great fro handbrushing or airbrushing. The only plus is that it's non toxic.
Laquer is a type of paint that I don't have any experience with as far as using. Some modellers swear by it. The paints that come in the Gundam color sets are laquer paints. It requires a speacial thinner, Mr. Color thinner is a popular laquer thinner, but you probably will only find it online on sites that sell Japanese model supplies. Laquer is the strongest of the three types of paints, it's also got the strongest fumes and I think it's the most toxic of the three. As long as you're wearing a dust mask or respirator, you won't have to worry about it.
As for painting techniques, I'll let someone else get into that, because I'm tired.
Feel free to add on to this post.