I assume you are plating this??? rather than buffet??? It makes a big difference on the quantities.

The cantaloupe and watermelon slice are fine. BUT a small bunch of grapes, a couple strawberries and a few blueberries would be much easier.

I would do 2 scoops, one the meat and the other either potato or pasta, 1/3 cup each. I would add 2 triangles of cheese slice (1 ounce per plate).

Dressing on the tables- low fat Ranch, Italian, balsamic

Assuming there are tables, I would put the rolls and muffins, in baskets on the tables. People passing these around increases socialization. At a table for 8, I would put a dozen rolls, a dozen muffins per table in 2 baskets and skip the pastries.

Skip the cinnamon rolls for dessert, get mini cheesecake bites or mini cream puffs from the freezer.

You can use the dessert planning page for help on the mix, and you can use the beverage planning page for help on the beverages. You need the dinner level coffee for the meal, as discussed on the beverage planning page, plus water and a cold drink.