How can I Make It Where My Character Doesn't Flip?

Hi! I was wondering how I can make it where when my player walks off an edge, he doesn't start rotating and flipping, his rotation stays at 0?

 

What are your rigidbody2d settings?
Under constraints tick 'Z'

 

Oh ya! Sorry, Im still a bit of a noob

 

By the way, I also got 2 questions for ya. How can i make it where I can only jump when touching the platform. And when my character jumps, he basics teleports 10 pixels up then floats down with gravity, and I am * the jump by Delta Time.

 

No worries, i am too.
You gotta start somewhere though

Unity provides GREAT tuts on how to develop your character in the engine.
http://unity3d.com/learn/tutorials/modules/beginner/2d/2d-controllers?playlist=17093
That tut will show you how to:
Jump/Run/Animate/etc. Very good tut, i think the scripting of the jumping is alittle past the midway point the video.