I have rich experience in developing iOS/tvOS app development and hence I can deliver you the quality work in a very short time frame. I have modules ready for all the basic functionality that an app contains. A basic app would contain
Login/SignUp Screen (Native or FB/Google/Insta) Home Screen + 2/3 detail screens. Feedback/Support screen Smooth navigation through out the app that would be self explanatory.
Any other requirements that you list.
What the Seller needs to start the work
Just let me know about the functionalities you need, UI design if you have, else I'll look for it, APIs needed if you have, else I can develop them for you. Thats all. You will get your work delivered within discussed time limit.