Develop a Mac Application

We are an accommodation provider, providing accommodation and food for students. We have about 50 students in our property. 3 meals a day, 6 days a week. Each week we generate a menu for next week and hoping they will be able to access the menu and let us know whether they will be coming back for dinner or not back. I guess each of them will be assigned an account and be able to log in and see what is for dinner today/tomorrow. This app will be a communication tool between us and them. If we need to make announcements, it will appear on their iPads, as each one of them will be given a iPad from school. This can be the first stage. Second stage if that we wanna parents in the future who would like to send their kids here to download the app and check out our photos and videos to help them decide whether they would like to book this place or not. I have no idea how much this will cost me. So do ignore the budget below as it was really rough. Thanks.