Another idea is to also run it as a Cafe during early hours (pending regulation) to make money off the morning crowd as well. You could offer breakfast pastries and basic breakfast menu items.
As far as the lunch and dinner menu is considered...
Keep it short and simple. Make it easy to cook the food.
BTW also play off the foodservice suppliers in your area for the best deals on food.
Definitely some breakfast stuff. I agree. Good coffee too.