All the setups and techniques are covered in this 20-page guide (PDF, ebook).  Adding a second light to your portrait setups can really change the game. As I’ll demonstrate in this guide, you can use a second light to:

• Separate your subject from the background. Sometimes your subject needs a little extra illumination when the key light creates strong shadows on one side of your subject against a darker background.
• Add interest to the background. Whether it’s against a plain seamless or an environment, a second light can be setup to add life to the background.
• Emphasize the physique. One light at a hard angle can really highlight tone and texture. This is great for figure studies and bodyscapes. But two sidelights, opposite each other, is a dramatic way to showcase an athletic subject.
• Go beyond one-light portraits. Traditional use of a second light is for fill lighting; reducing the contrast and shadows created by a key light. With practice, you’ll gain skill and an eye for adding in just the right amount of fill lighting on the shadow side of any portrait.

I provide all the settings, distances and placements involved, and details on the gear I use.  You can use any lighting you have, I only include the specifics of my gear for reference.  Each example contains sample images, showing you the result you should try to reproduce to learn the technique, a basic diagram of the lighting setup, and a behind-the-scenes photo of the actual setup.