How do I make an animation for a 2D game?

Hi, so I have a sprite sheet, and I want to see how I can animate all of what it does. How does he keep looking left when you move left, playing the animation and stuff? If you have a hard time understanding, let me know so I can kind of show you what I mean.

Thanks!

I've attached the sprite sheet so I can show you what it looks like.

 

This is what you are looking for.

http://unity3d.com/learn/tutorials/modules/beginner/animation

I think your find the answer in the animation scripting section.