If your target-customer base is rather upper-middle class,you'd definitely would like to add some special kick to your menu by adding some exotic flavour ( Asian or Middle Eastern ),since these folks usually have travelled a bit and would appreciate to have something a little bit un-common.
Pizza and Hamburgers are the least appealing ingredients to a restaurant menu for many,unless you specifically target that group- but then you don't need our advise but just a good supplier of meat,potatoes and a pizza-cook (hey- make it at least a guy from Napoli..)
If you'd like to look a little bit further than that ,you might want to specialise in some form of ethnic food,trype of dishes (just salads and chicken,great cheese plates and terrific deserts..)-have a decent wine -card ( If you have a licence ) and tons of different imported beers.( let's face the bitter truth - American beers tastes like cat-p... compared to Belgian German or Czech beer )
How many seats do you intend to run and how many personnel would be involved in the restaurant?
Please respect animals - don't eat them...