Direct Live Streaming video Application

Hello, I need to create a mobile application on IOS and Android and on Windows PC to sell products live video streaming. on the application I need a live chat and also to be able to communicate vocally with my microphone to interact and take their orders directly with my customers it is also necessary that customers must have a user account and be identified and authorized to see the live by our moderators and to be able to ban the detractors of the live... If you are able to create this application for me please write to me and give me a clear and precise total price for this application I will not respond to the person who will contact me without the total price thank you.
some exemples.

https://appadvice.com/game/app/meetshop/1661526116
https://www.youtube.com/watch?v=si4P_IKZd20
https://www.youtube.com/watch?v=dbXARqoyAN8