How to design game 2D multi screen with Unity?

I want design game 2D for mobile but I can't know how to design sprite,image,text,button... auto scale with screen . pls,help me ! Thank you !

 

Take a look at this:
http://unity3d.com/learn/tutorials/modules/beginner/2d

And for the UI:
http://unity3d.com/learn/tutorials/modules/beginner/live-training-archive/the-new-ui

 

Thank You , I'm watching

 

I have a image splash size 640x1136 (iphone 5s screen ) I want at run game in iphone 4s (480x640) this image auto scale ? How to?
Thank You !

 

Splash screen is a pro only feature so you have the pro unity license?

http://docs.unity3d.com/Manual/class-PlayerSettings.html

 

T

Nice !