Start out on the bunny hill of course, and don't leave until you have control of both heel and toe edge turns. Some pointers: Keep your weight forward on your front foot. If you try to turn by moving your front foot, 90% of the time you will fall. Use your back foot as a rudder to control you turning radius. Start slow and keep moving up faster. When learning toe edge, I found it easiest to make sure I looked where I wanted to turn and letting my body do the balancing rather than concentrating on my balance first, direction second. Lastly, once you have control of heel and toe edge and are ready to try riding switch/fakie, I found the easiest way to learn is to do two turns regular, switch to fakie, do to turns and repeat. This allows you some more control of your speed and really allowed me to catch on really fast, but safely.
I was a slow learner with snowboarding, and above is just some tips to think of. Every person learns differently and has a different idea of the best way to learn. Good Luck, and most importantly just have fun.