Go to allearsnet.com, click on Dining, then click on menus. You will see a list of WDW restaurants. Click on the ones that say counterservice beside their names. They will give you an idea of what's available. On the
DDP you get an entree, nonalcoholic beverage, and a dessert. The entree may or may not include sides. If it does it will be listed on the menu as fries, apples slices, baked beans with corn muffin (the sandwich or ribs at Flame Tree BBQ), choice of potato and grilled veggies (the steak at Pepper Market at CSR), soup (with the sandwich at La Kringla bakery), mashed potatoes (with the chicken at Sunshine Seasons), mashed potatoes and carrots (with the chicken and rib platter at Cosmic Rays), etc.
Think of CS as Mc Donald's, Long John Silvers, Taco Bell, etc where you go to the counter, order, find a table, and eat. The exceptions to this are the CS at Wolfgang Pucks Express and the Pepper Market. At WGP you order, find a table, and your food is brought to you on real plates, at the Pepper Market you are seated and a waiter gets your drink, while you go to the different counters and order.