You can email the specific owner, do a targeted inquiry to all 3-bedroom, etc homeowners, or do a general inquiry which goes out to ALL owners (don't do this...well you can but you'll get a ton of mail back).
All of the homes are independently owned and operated. Some owners will do a Sat-Sat stay only, most will let you come and go on any dates you please, as long as it's open on their calendars, but if you stay less than a week you can expect to pay the cleaning fee. The rates vary from home-home depending on the size of the home and the quality of the amenities and furnishings, so it's hard to give you a general idea of price. It also depends on the time of season you're visiting as rates change dramatically around holiday seasons / periods, for instance.
There are 2/3 bedroom condos in Windsor Hills, 3 bed / 3 bath townhomes with splash pools, and 4/5/6 bedroom pool homes / villas in the resort, and of course an incredible pool clubhouse with pool, waterslide, hot tub, sundry shop. Also things like playground, tennis, volleyball, basketball, putting, a movie theater, game room, etc in the resort, all free for all guests to use.