I switched from skiing to boarding when I was 11... Best thing I ever did. No offence to skiers but snowboarding is WAY more visceral for me. I would rather carve on a board, something about it is just more focused. It is certainly more challenging in rough terrain, glades, steep chutes etc.
I took three lessons though my school including a rented board to start. I've helped a lot of people get into the sport since then (I'm 30 now) and I suggest the same thing to all people. Rent to start, try to get a mid-range rental board and if you can ride the same one for a few days, do it. The first few days are all about being on your knees and ass. The sooner you get the fact that you HAVE to keep your edge up, the better, and learning on one board is better than constantly changing.
When you go to buy a first board, spend the money on boots that fit and are comfortable. They need to be fairly snug. Most people ride with boots that are far too big and their heel moves around. They actually should feel about 75% as supportive as ski boots.
Then I would suggest getting a decent 2-3 year old used board. There will be a lot of different schools of though on camber vs. rocker vs. all the different base profiles now. I just taught my girlfriend and she's on a standard camber board. Call me old fashioned but I think skill keeps you off your ass, not changing the profile of the board to make it "easier".
I'm going to get flamed for that.
Also when you start, the bunny hills are basically useless. Unlike skis you can't just stand there and go down the hill, you'll rotate, catch an edge, and fall. A very tame, wide open blue would be what I suggest. You start by having the board perpendicular to the hill, you sitting on your butt facing straight down. Step one is to stand up and lower your toes enough that you slide forward down the hill. This is a heel slide and is the building block of all of snowboarding. Then you move on to a toe slide, falling leaf, linked toe and heel slides (basic turns), then beginner slider turns, advanced slider turns, and finally carving.
I strongly suggest giving it a try. Most hills in Ontario (I take it that's where you're from?) have a learn to board package for $30 with beginner lift ticket, lesson, and rental. Blue Mountain has a decent learning area with enough pitch to actually allow you to heel slide unlike some of the smaller hills in Ontario. I honestly think you'll get hooked! I was a crazy skier, jumping all over the place, bombing, just generally being as much of a hooligan as I could be when I was 10/11 but I got bored. I have NEVER been bored on a snowboard. You'll find me riding through the trees now on a cold day, carving hard on fresh groomed mornings, dropping off little rock cliffs into powder. I've got to the car at the end of the day and could barely walk once I took my board off, but on the hill I felt like gold. That's just my take on snowboarding...