Mouse Movement and other tidbits.

Hey there,

I'm looking to change part of the movement scheme to the mouse, so that where you aim the mouse is where the character faces (lust left and right) and that if you are facing the opposite way you are running your speed will be cut in half.

I have some ideas of what I could do for the code, but not a clue as to what .cs file to put it in and where.

Any help would be greatly appreciated!