Do I need to use expert mobile app development services to make a mobile application?

I wanted to know whether there was any way to increase enrollment in my culinary classes, which I provide to both men and women. I firmly feel that having my own mobile application would enable people to sign up for my programmes online. I would videotape my classes and submit them for everyone to see, and the payment would be made online. I want to know if I can employ a freelance developer to do the task or if I need to use a professional mobile app development service.