All advice is good.. snowolf's youtube videos are great... (now if someone would tell me to stop being a baby when i try new things in the terrain park, they'd come in handy more).
My advice... JUST DO IT. Don't think too hard about it, and go into it hard. It too me a LONG time to get comfortable toeside but just know its something you have to do.. its not an option if you want to get the best out of your riding.
Good luck -- at your age, when you're my age, you'll be kickin it pro.
Life will pass you by if you don't jump on.