Using a jetpack compose $,$ i have made a data models$($conversation$.$kt$,$ message.kt$,$sentDetails$.$kt$,$user.kt$)$ and repositories for corresponding data models. Now how to i make a UI layer of my messaging mobile application?

i need three screens $($ListOfConversationScreen$,$ ConversationScreen and UserCreationScreen, and set up a navigation with in a app by using navgraph, also need to implement ViewModel and ViewModel factory and how do i create function test for the components created.

i need to code this in kotlin.