Hi agree with Eileen on this and the link she kindly provided will give you a great deal to consider. You should also check out utube for videos and demo's they can be quite good once you cut through the dross of people who really don't have a clue.
Lighting is very complex and you never stop learning, which in my view is a good thing, as great photography is a journey not a destination.
My advice is try things out yourself, much of the lighting techniques I use are not from books or things I've read but purely from methods that I have invented through expereince. For instance on a general scale people oftne think of flash as a substitute for not increasing ISO however some of the best images and photography I've seen have been born from mixing the two. Don't forget that quaility of light is the key in most cases not 'quantity', a lot of people make the mistake of over lighting a situation and also trying to get too complex. I use a couple of SB800 on radio triggers (skyport) and also a Elinchrom Ranger system however most times I use only 3 lights, this being 2 heads and of course the sun, never forget the sun is a light source and possibly your most controllable one!
Good luck
I've posted a example below of a shot using 2 heads, one head to the right with a diffuser and one to the left fireing hard into the door area.
Rgds
Tim
Ambient Life - DCM Gallery
Ambient Life Web Site