Almost all these items, including all your adult foods. are covered in the plan for 100 table. I generally allow 1 burger (4 to the pound) PLUS 4 ounces brat per person for all the grownups, you will have some left but less than you expect, and grilled burgers do freeze well. There are recipes for all the rest as well as the tables, just make 3/4 the amount for 100. In case I haven't posted it yet, here is the cuke salad for 100.

arts

8 1/2 pounds cucumbers, sliced thin
1 1/4 pound onions, sliced thin
6 cups sour cream
6 cups mayonaise
3 teaspoons salt
5 tablespoons sugar
14 ounces light vinegar
1/4 cup dill weed

How early would i need to start frying fish, fries and hush puupies to be finished befroe lunch?

You don't say how many people. There are caterers who specialize in bbq and fried fish, and one option is to hire the fryers and do the side dishes yourself. Another is to look into ordering the fish, fries and hush puppies and pick them up or have them delivered at lunchtime.