I agree with everyone else about renting equipment. Even our in-laws, who are black diamond skiers, do it.
I also highly suggest biting the bullet and paying for ski classes. I've heard too many horror stories from people who let their friends, relatives, etc try to teach them. It's much safer to let the "pros" handle it.
The amount of "stuff" you need depends upon whether or not you have a washer/dryer available. When I have one, I bring two sets of thermals, two sets of socks, one ski sweater, three turtlenecks (I wear one with regular pants for going out) one hat, one pair of gloves, one bib, one neckwarmer that is long enough to pull over my mouth, one jacket that I use as outerwear when not skiing, also. You will also need goggles, even though good sunglasses may suffice. If it's cold, the googles give more protection, and they work better in low light conditions.
This is the MINIMUM of clothing needed. I also suggest trying to borrow things, and check in "used" sporting goods stores (although most in FL don't carry very much) JC Penney usually has clothing that can be used for skiing, along with Sports Authority.
I'll warn you; skiing is VERY expensive. Makes WDW look like a bargain.
