Well, this thread has made me feel a little silly. My bindings are set perfectly straight. I guess that would be 0? Both of them. On my first day out I had back leg at 0 and front leg at some crazy ass angle. My husband set it up for me. Then I figured that I would start at 0 with both and start adjusting from there. lol Think maybe this is why my last lesson went soooooo wrong? Oops.
LOL no worries as long as you didn't hurt something then no harm was done!
A good compromise between a full on symmetrical duck stance, and a forward stance would be something like -6 or your back foot, and +15 on your front. That stance should be great for the first year or so and then start adjusting from there. If you spend too much time adjusting stance while you're learning you may have trouble learning the basics.