If you are on the regular dining plan, it will cover an entree and dessert, plus a non-alcoholic beverage. No first course, no appetizer. You may order one as an entree if you wish, or pay extra for one.
If you are on the deluxe plan, that will cover one appetizer, one entree and one dessert, plus a non-alcoholic beverage. It appears any appetizer or first course may be ordered on the deluxe, with the exception of two sushi dishes: Yoshi's Deluxe Platter and the Snake in the Grass. These may be ordered only as entrees.