There are three
Disney Dining Plans, and here is the quick overview of what each entails;
For each plan, you get the following number of meals/snacks per evening that you have in the hotel
Quick-Service Dining Plan: 2 quick service meals, 2 snacks
Standard Dining Plan: 1 table service meal, 1 quick service meal, and 1 snack
Deluxe Dining Plan: 3 table service meals, and 2 snacks
Remember that you can redeem a table service meal 'credit' at a quick service restaurant, if you wish. Each of the plans should be linked above, and you can see what restaurants are part of the program.
As for the reservations, you still need to make your own Advanced Dining Reservations at 407-WDW-DINE (407-939-3463) for any meals you want to be sure to secure. Simply ordering the plan does not secure any particular reservations immediately. I always recommend making as many reservations as possible. You can always cancel them later!
Please feel free to send me a follow-up question by visiting my bio page.
Have a delicious vacation!