We are looking for team who can accomplish a task of webinar in app

Hi, we are looking for team who can accomplish a task of having webinars in app, native android and ios application from scratch

1. need to know what all developers would be required like UI/UX etc etc
2. scope of work
3. time you would require to complete it
4. regirious testing
5. what all things you requires from me , like domain and AWS server


this are the listed features what I need
1. booking webinars
2. join and attend live webinars

also some more additional functionalities also

• QnA box for user to ask questions to the host
• Host joining facilities
• My booking section for users to view their bookings and join


also what I have in mind is two ways what I thaught could be, but if you know third way do tell me
1. one is app integrated
2. we can use third party zoom or so

I need pros and cons of also both if any of these two if you will use else you using any third thing give me pros and cons

I don't know what budget it would be , for posting I am posting it now. but I need you come to me with all the answers and pitch in your budget .