Use the following ratios as your starting point
1:1 for beauty,
2:1 for portraits of women,
4:1 portraits of men,
8:1 Character portraits, artistic photos and similar
If you don't know better: Start with your favorite ratio, mine is 2:1, I set my Mainlight to 1/4, fill to 1/8
Make a photo
Check the contrast
Tune from there
When in doubt, go for a smaller ratio. It's better to shoot the photo a bit to boring and then add a bit of contrast in postprod in lightroom, then shoot it with too much contrast. LR let's you add contrast without any loss of quality, but quality will always decrease once you try to lower contrast
For your lighting ratios to show, use an angle of 45-90 degrees between key- and fill-light.
Your flashes have to light your subject from different sides in order for your ratios to take effect.
The chosen light ratio will show on your photo in those areas where your light sources don't overlap
Check out the podcast for my attempt of explaining the basics of light ratios.
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