Try this thread for a list of tutorials and other resources. It’s stickied at the top of the Carrara forum:
Additionally, if you want to pick apart a light rig or two, I have two included with my free Fantasy Village Terrain available from my ShareCG account: http://www.sharecg.com/v/69697/view/5/3D-Model/Fantasy-Village-terrain
If you don’t like ShareCG, I also have it on Dropbox. No account required:
No postwork and no GI in the attached image. Click for larger as the thumbnails provided by the forum tend to look dark.
Click thumbnail to see full-size image