If you don't think you're going to do many - the best thing to do is to use your staff. Busboys, dishwashers, hosts, you can usually find someone. If you can't spare someone, test out for a week having your own delivery guy. Pay him $40 a shift + tips and see what happens. If there's a call for delivery which it sounds like there is, I wouldn't deal with a delivery service. Doing it yourself would be much more economical. Regardless, start your delivery range small and treat deliveries like you would a customer in the restaurant, if not better. You can't entertain someone at home who is waiting for their food like you can in the restaurant.