Sleep Coaching App

I would like to create an APP where my clients can sign up into there „personal space“ and complete their sleep journal every day until the coaching is finished. It should be real time so that I can have access to the journals at any time. It would be great to have the option to get a complete evaluation of the last journals immediately or a summary so that I could export it.
As a second step I would like to create a compleate sleep coaching APP.