I need a program to manage lessons and instructors at a windsurfing school

We are currently working on booking accommodation on the [login to view URL] program. We would like the instructor and lesson management program to look and function similarly. The main features of the program: 1. Choosing what type of training, whether windsurfing or kitesurfing, foil windsurfing, wing foil, the possibility of adding a different type of training 2. Within the type of training, the choice of how many lessons (from 1 to 30) 3. As part of the type of training, the choice is whether there are lessons for 2 people or group lessons or other 4. Allocation of prices to lessons (the price changes depending on whether individual lessons, double lessons or group lessons). Possibility to manually change the price 5. Customer database with the option of paying for lessons 6. Possibility to mark if there was an advance payment 7. Instructors database 8. View the assignment of clients to the instructor 9. Instructors can log in individually 10. Possibility to enter individual% per lesson for each instructor 11. Calendar with the option of entering reservations, with the possibility of entering comments 12. Possibility to confirm the lesson by the instructor from his individual login 13. Possibility to modify the time of the lesson by the instructor from his individual login (sometimes the real time of the lesson was different than booking