Write an iPhone and Android application

App development The main idea of the app is to allow people to buy different services First page will have 2 sections: 20 Dollars 20+ Dollars and in each section it will have 5 categories of services 1) Graphic and Design 2) Writing & Translation 3) Video & Audio 4) IT & Programming 5) Business and in each of the 5 categories, will have around 8 services so when a consumer clicks on any of the services, they will see a sample of the service with brief details of it, and if they want to buy it, they click it and then provide a brief information or description of their project or what they require in that service, and then choose couple of options (multiple choice, or choice questions), and their name, email, and number. Then me the app owner will receive an email with all the details they chose, it would be nicer if it can be organised in a website or a database. Simple and beautiful design * I also require a website with an easy interface for me to be able to change aspects of the app, and then update it live instantly