I have to disagree with ice-boy. I have purchased light sets from artists such as SaintFox and Mec4D so that I could study how they were made. I'm an oldie on this site and I remember back in the P4 days when people could upload whole pz3 files to the freestuff and you could download them and then study how the scene was set up. You could check the camera and it's settings, you could look at lights, textures, poses. Basically learn by picking the pz3 apart. I learned an awful lot that way.  Nowadays, you can learn by picking apart lights you have purchased and looking at the oodles of threads about lights (especially those that show screen shots of the light settings).

"A lonely climber walks a tightrope to where dreams are born and never die!" - Billy Thorpe, song: Edge of Madness, album: East of Eden's Gate

Weapons of choice:

Poser Pro 2012, SR2, Paintshop Pro 8