Development of an application for iOS

It requires the development of an app containing videos about cooking from the chef. It is planned to create a free version to familiarize yourself with the product, followed by purchase to view all the content, which will be updated regularly. At the moment there are about 50 rollers for 5 minutes each. The contractor is required to perform the following works: develop an application layout; coordinate the application layout with the customer; develop an application for iOS based on the layout approved by the customer; hand over the work to the customer by testing it with a group of users and the customer himself; place it in AppleStore; give recommendations for further promotion. For a fee, the work on maintaining the product is offered: filling with additional content; possible changes in the program interface.
Please indicate the timeframe and cost.