Build functional app with booking, payment, and more functionality

I’m looking to have an app developed for my cleaning service. I want the customer to be able to fill out a form of some questions, get a price, schedule an appointment, have their card be charged after I complete the service, have an about page, contact page, and be able to issue refunds. I would prefer it be done in approximately 2-3 weeks, but the sooner the better. I will need a website developed very similarly in the future. Also, I have no knowledge of this process and will probably ask a bunch of questions!