I think it would save your hair from going grey if you did some of the MIT tutorials first. After that, Power User Juan Antonio has some excellent guides on how your App Inventor App can control hardware like the ESP32, including using an on board camera.
Also, prepare for failure! Actually a fair amount of learning comes from making mistakes - we have all been there and done that. So plan what you are going to do on paper first, and let yourself enjoy the challenge. It's frustrating when something doesn't work, but when it finally does - brilliant!