If you want to shoot in a photo studio but aren't quite sure how to set up the lights, you're in luck. But this applies only if you have an iOS device.
The Light Studio app is a nifty program that can simulate the type of lighting you want to achieve. It tells you how many lights you need and where to position them. There's also a 3D model onscreen that changes appearance depending on the lighting you stipulate.
For just $1.99, the app is quite a steal, especially if you know nothing about studio lighting and want to give it a shot.