I found the following to be helpful.  It's alot to digest.  I'm constantly struggling to get lighting right.

Hope these help:

http://www.nggalai.com/tutorials/tut_01.htm

http://www.newtek.com/products/lightwave/tutorials/animation/lighting-002/

http://www.alquier.org/linfa-net/cg/archives/_cg_concepts/lighting/

http://www.itchy-animation.co.uk/light.htm

 

Persevere,

Mark

"Simplicity is the ultimate sophistication." Leonardo da Vinci