Hi Jennifer,
When you check in to your Disney World Resort hotel you'll be given a Key To The World card which will have all your dining plan credits on it. As you're on the Quick Service Dining Plan you'll receive 2 quick service meal credits and 2 snack credits per night of your stay. For example if you're staying 5 nights your card will show you have 10 QS and 10 snack credits. You can spend these in any order you wish up until midnight on your departure day, so you could have 3 meals one day and 1 the next if you wanted! You can view the 2009 QSDP brochure by clicking
HERE, it lists what is allowed on the plan and the participating restaurants.
Some of my favourite quick service restaurants are Columbia Harbour House in the Magic Kingdom, Sunshine Seasons in Epcot, Pizzafari in Animal Kingdom and we love the food court at Port Orleans Riverside. For snacks make sure you look for the purple DDP sign on menus, our favourites are funnel cakes and Dolewhips in Magic Kingdom, crepes in Epcot and anything from Goofy's Candy Company in Downtown Disney. Generally any single serving item under $4 is counted as a snack!
Hope that helps and you have a great trip,
Jo