You also need a planned appetizer area set up, and here is why:
u May Need an Appetizer Table
A self-catered buffet is a real challenge to the organizers, and things don't always come together as smoothly as hoped. By planning and setting up an appetizer area or "nibble table" which is ready when the guests begin to arrive, the cooks and servers have time to complete the arrangement of the dinner buffet. This is especially critical if there are children among the guests, or there is a wait before dinner, as at a wedding reception.

This does not have to be complicated. Three items, plus a punch, or two if one is alcoholic, are sufficient. Typically, include a fruit tray, a cheese tray and an attractive dip or spread; or you can go with a dinner theme such as TexMex with chips, salsas, Texas caviar and guacamole; Italian with bruschetta or antipasto; maybe shrimps or other cold seafood, if budget permits.

One appetizer service area is needed for each 100 guests, so you would do 2.

Hot Dogs,
B-B-Q Pork Sand,
You must add an entree for the non-meat eaters- there are really good veggie burgers and sausages available, usually in the produce or freezer department. I particularly like the "field roast" brand. Get about 24.

B-B-Q Beans, 5 gallons, and make at least some meatless
Potato Salad, 6-9 gallons, about 60 pounds of potatoes.

simple green salad
tomatoes,grt'd chse, bacon bits
Use amounts from the plan for 100 list and double

Lemonade, at least 16 gallons, appetizer table and dinner
Add iced tea, 16 gallons, about 1/3 unsweetened
about 1/2 pound ice per person

Write back if you have any questions.