Some RPG Maker 2003 questions
 

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.

Check the FAQ

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It's just a line of events...

<>Move Event Blah Up Up Up
<>Message: "what"
<>Move Event Blah Up Up FaceDown
<>Message: "yeah"

(Move Event is on Page 3 of the event commands.)

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You can use Pictures, or Parallax backgrounds on mulitple maps (see your other thread, my first answer, for how to use Parallax backgrounds).

Pictures are just.. pictures, but you can activate them using an event. You can show the picture, move it around, and erase the picture. Obviously, you'd import them into the Pictures directory. 320x240 = full screen picture.

You can even have scrolling credits if you use them properly.

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Same as above, either Pictures or Parallax backgrounds (aka Panoramas)