The company you rent from should provide you with a basic list of what to bring as well as what items they provide. I know the WBC location provides all linens, basic kitchen appliances, basic (VERY basic) cooking items. They also provide a limited amount of disposables - 2-3 days of dw detergent, 1-2 loads of laundry detergent, plenty of trash bags. I think most timeshares do that. If you plan to cook, and you want to do anything that requires more than 2 pans, 1 frying pan, and one cookie sheet, you will need to bring your own. I usually bring disposable muffin tins and spices. If I really plan to cook, I might bring a medium sized crockpot and some decent mixing bowls. But you can pick up cheap ones at
Walmart if you really need them.
We have rented from places that are not timeshares, and those normally require that we bring our own linens, paper towels, etc. Those are usually beach houses / condos rented through real estate agents. I find the kitchens to be better equipped in those types of places, as folks do more cooking on beach vacays. Often, we'll find that we need something (muffin tins, a colander), buy a cheap one and leave it there. That's what my folks taught us to do, and it seems like a lot of people feel the same way.
But your rental agreement should tell you what you really do and don't need.
For ease of living we bring:
~ a couple of cheap night lights for the hallways
~ books / puzzles / magazines / travel size games
~ dvds
~ detergent pods from home (we do a lot of washing in the condo)
~ toys for our kids when they were younger