Finger sandwiches - Egg salad, pimiento cheese, cream cheese and marmalade
I would definitely add one meaty type, thin roast beef or ham, ham salad, etc.
Plan 1 regular sandwich per person, cut into 3-4 pieces. Pepperidge Farm makes a thin sliced bread nice for these sandwiches
Mini meatballs- 10 pounds per 100, 3 quarts sauce per 10 pounds

Fruit trays, use the fruit tray page for amounts- you want about 1 pound ready to eat per 15
Veggie trays, use the veggie tray page
Ranch dip as suggested on the page

Cheese trays, 28 pounds
crackers, 18 pounds

chips, 1 pound per 15
dips, 1 pint per pound

nuts, 12 pounds

Mini cream puffs- 2 per person
Home made cookies- smallish, 2 per person
Sheet cake- full sheet serves about 60- 2 2 layer sheets would be possible, or 4 single sheets

Punch- 24 gallons
6-8 gallons unsweetened iced tea with sweetener selection for the no sugar folks

bottled water- I would get 500 bottles, somewhere I could take back unopened cases