Create an Iphone app for on demand service

I'm creating my company and I woulk like to create an app which will match cleaner with homeowners You will create an iPhone app like Exec cleaning. (it's like uber for housecleaning). Functionnalities : - Matched up cleaners and jobs - Simple 3 steps for booking a cleaner (like exec cleaning) 1/ Sign up with Facebook or by email, 2/ A button Book Now or selection of date and hour, 3/ Payment system (to be discussed how to implement this functionnality) - Matching the right cleaner to the right customer depending of the availability of the cleaner and the hour booked by the customer - Rating system (the customer can rate the cleaner) - Possibility to send sms when the cleaner is coming into the house, when the job is done (like Uber does) - Setting page (with my account information, payment information, promo code, sounds, invite friends via email, text message and Facebook), call support button, log out button - Functionnalities to be added in a next contest. Design : I didn't think about the design yet but it will be very important for the success of the app, so don(t hesitate to come up with some ideas and propositions. I thought about a green colour identity. A minimalist design will be perfect. The app must be easy to use for the customers like Exec cleaning.