I find it helps to change which shoulder i look over after each turn. so when i'm turning switch right, i have my left foot a bit more forward than my right foot and look over my right sholder, and when i turn left, i look over my left shoulder and keep my right foot a bit more forward than my left. basically look in the direction of your turn because if you look over the other shoulder you won't be able to see where you're going very well and probably crash or not be able to link turns very well.
start on almost flat and work you're way to steeper terrain.
if you are just starting out, it can help to make switch pizza/wedge turns before moving into parallel turns.
you can do wedge and bring your skis parallel at the end of each turn until you're confident enough to ditch the wedge and turn only parallel.
hope this helps. good luck