look over the shoulder that you spin switch with because that is the dominant shoulder/side of your body. i have seen a really good skier from my resort who looks over his other shoulder when he spins so it is really what is most comfortable for you
what i think i've figured out about riding switch is that the shoulder i feel most comfortable looking over corresponds to how i stand on a skateboard (regular or goofy) i stand goofy and therefore find it esasier to have my right foot lead the staggard stance, and to look over my right shoulder,
i've developed a hiccupp when it comes to looking over my left shoulder because i can't ride left foot forward very well.
as for actually riding swich, staggar the legs, bend your knees, and leen forward over your tips. Take your time out on groomers and try to keep your field of vision open to as much of the mountain as you can
whatever makes you feel best son.