For the light meter, you should measure the amount of light from the Main Flash, then depending on how much contrast you want, measure the flash from both lights and adjust the second until you reach the aperture you want.
For instance, 1:2 ratio of light is low contrast, so the main light would be measured at f/2.8 (example), and the combination of lights would measure at f/5.6. You would fire both flashes, and adjust the second unitl the total amount of light hitting the meter reached f/5.6. Remember to keep the meter pointed at the camera's position, not the light's.
The camera would then be set at f/5.6... the shutter could be set at 1/30 (it really doesn't matter which shutter speed you use since the camera will only see the image when the flash fires).
Once the lights are setup, have your subject hold a large white board and take a photo, then choose custom white balance from the menu and set it to that photo. You would then need to set your WB to custom.
