1 - How do Switches work?

2 - How to make an event moving in dialog(He says something and moves,
then he stops to say another thing,then he moves again,etc...)

3 - How to make an Introduction.Ex: (After start menu,when you click new game,
appears something like: One entire World is being destroyed...
And you're the one predestined to save it...

And then appears the title of the Game: The chosen One

4 - How to make appear Chapter One:Chosing ) in the middle of the game.

If you can answer at least one question that will be helpful,thank you.