Kelly,
Welcome to PhotoCamel, I'm certain you will love it here.* Rumor has it my tutorials are the greatest.
* Shoot and request critique, then learn from the critique and reshoot.
Try this. Set up your fill light behind the camera on the SAME side as your main will be. Your fill light should be a large soft light. Set your meter AND your camera at ISO 100.* Meter your fill light ONLY holding the meter under the chin of your subject and aiming the dome of the meter at the fill light.* Make a mental note of that reading and shut off the MODELING LIGHT ONLY of the fill.* Set your main light up on one side of your subject so it casts a shadow across the cheek on the opposite side.* Meter both the main AND THE FILL by pointing the dome AT THE MAIN LIGHT ONLY and firing both lights.* Increase (or decrease) the power of the main light ONLY until it is about 2 stops MORE than the fill reading alone. SET THAT aperture into the lens of your camera.* Assuming you are in a room lit by normal lights the shutter speed can be anywhere from 1/60 to 1/125 or so. I usually use 1/100 of a second.* The rule about the fill light is that it should "follow the nose."
Benji
P.S. I edited my lighting diagram and added the distances to the subject as you suggested. Thanks!
I also added an image showing an actual set up during a shoot.
My main light is a 24 x 32 inch softbox and is about 30 to 36 inches away from the subject FEATHERED so the light is NOT pointed directly at the subjects face (see my lighting diagram above.) As you can see the ONLY lights that are pointed directly at the subject is the hair and kicker lights.