Lighting

[beaker]

With Kino Flos:
http://www.kinoflo.com/

They create nice soft even light.

[jasonsco]

I agree with Deke . . . Kino's are a great way to go. You can even get the green ones . . .

The bigger idea that Deke's trying to convey, though, is that you want even light--no hotspots or shadows.

[Aneks]

Kinos for sure. Light to within 1/3 an f-stop of key exposure. Best if everything is lit to match key exposure. Then all you need to do is ensure that nothing kooky happens in transfer !

[A_Ghost]

I also agree with the above answers - green kinos, but if you also mean how to light a green screen, the you want to ensure, first of all, that your green screen is far enough away from your actor to avoid green spill (especially evident if your subject happens to have blonde hair). These kinos should also have blockers inbetween the light and the subject ( again, to reduce spill). The placement is to have an even spread of light on the GS. Place the lights vertically (if you have tube lights) low on either side of your GS. Don't put them too close to the Gs, or you'll get hot spots. Angle these 3/4 to center. Try not to overlap centers or this will also create a hot spot. If budget allows, a top kino, suspended ( now horizontally) will also add to evening out the tone of the GS.
Another couple of techniques we have used is self-illuminated GS (expensive), or backlighting the GS - this diffuses the lights nicely - provided your GS isn't a cheap one that has blotching or seams.

Hope this helps!

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