Hello, Kayla,
Since I'm limited on space, I'll try to give you the highlights of each plans:
Deluxe Dining Plan: 3 table services or quick service meals a day. The table service meals include an appetizer, entree, dessert, & non-alcoholic beverage. You will also have 2 snacks a day as well as a refillable mug for each guest on the plan. The costs are (for each guest, each night & subject to change) $86/$89 for adults 10+ and $24/$26 for children ages 3-9. The price varies by season.
Premium Dining Plan: In addition the details of the Deluxe Dining Plan, you will also have unlimited recreation (including golf) as well as tickets to Cirque du Soleil's LaNouba. Same details regarding cost as listed above; $179 for adults 10+ and $129 for children ages 3-9.
Platinum Dining Plan: In addition to the Premium Dining Plan, you will also have pre-arrival planning, a fireworks cruise, reserved seating at Fantasmics, Disney's Photopass CDturn-down service, and spa treatments. Victoria & Albert's Restaurant is also included in this plan. Same details regarding cost as already stated; $239 for adults 10+ and $170 for children ages 3-9.
I've included links to each of the plans so you can read more about the details of each plan.
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