Need an app for android and ios for my page tareashop.net

Hello, my name is ivan, and I have a page called [login to view URL], what I would like to do is an application for android and ios. In my page we do school tasks and projects for people who need it in exchange for money, what I want the app to do is to be two platforms, one for the clients and one for the collaborators that perform the tasks. For customers, they have to enter the app and register for free, then there will be a list of all the services, tasks, essays, presentations, readings ... if you choose readings for example, they will ask you the date, how many pages are, if they have the pdf ... and based on that take the price, if the customer accepts can pay by card, paypal or upload the photo of the receipt of payment in a store. The platform of the collaborators will have to ask to be able to enter the first time they specify in which areas they perform better, mathematics, Spanish, physics, programming, etc. When the clients pay for their work, they will be automatically sent to the collaborators' platform, they will see the tasks and there will appear the price for carrying them out and the date in which they must deliver them, they will decide which one they choose.