How to Make a Web App

So basically I’m a student in university and i coded an app in javafx as a personal project to make creating a schedule each semester automated. As in i dont have to go through all the different time slots for each class my program just makes all the possible combinations and i just choose the schedule that works best for me. The problem im having is i also want to put this program onto a website so that my whole university can use it and maybe charge a dollar or 50 cents per use and help pay off tuition haha. But i dont know how to get started or even all the tools i need to consider and just everything like reprogramming and stuff like that. If anyone can help that would be great :)