If your feet look like this:
You are in duck stance at +15, -15. We quote front foot first, and pointed fwd is positive numbers.
If like this and you ride goofy
You are at +15, +15
I learned with this stance, bad idea for me, created on open shouldered, facing forward posture that I had to unlearn.
If you can learn in duck stance and work on switch early you'll fall more but benefit later I believe. If that's too weird consider +12 or +15 front and something like -6 to +3 on back.
I heard the Aussie learning program emphasizes learning moves switch as they are learned regular or right after, seems like a good approach to me.