Mobile development

I need an iPhone/iPad app. I would like it designed and built. We need an applicatin that works on android and iphone The application will eneable the user to do the following 1- pay to register for the training course they will attend and the training is time bound 2- The training can be uploaded in the app and each subsciber can download the material on theri own pace provided it has a dead line from the date of enrollment 3- the training will be done through pushing material to the subscribers The training material will be in the form of videos, text, audio, 4- The app should be linked to email to receive feedback and send feedback 5- include FAQ section 6- inetractive function to allow for discussion 7- enable the app to do voice over to record lessons It will be good if you can the voice over entry with a software to change the voice of the speaker to a male voice 8- have a section to explain (about us) 9- the app will have Arabic fonts 10 the app will allow the trainer to put all the training material ready and when a user start the course the material will be pushed on a set timing 11 the app should have a notification function to inform subscribers of the new materials that are uploaded Can you please share with me samples from tour previous work And tell me the cost