If you're purchasing a package, you'll get your room key & tickets on one card that has your name on it. Each member of your party gets their own room key. The CM will ask you if you want to put a credit card on file. If you do, your room key will be coded as a charge card as well - $500 at value, $1000 at moderates, $1500 at deluxes are the limits for charging.
Anyone 3 and older will get their own room key/tickets with their name on it. You can have the kids' cards coded not for charging.
You'll also get some guides on WDW, a map of the resort, a parking pass if you have a car, and a newsletter that the resorts produce.
Have fun!