Bomberman movement script?

Hello guys new to unity and i am making a maze game.
All i want is a bomberman like movement that when you press w (up) s (down) a (left) d (right) that you will instantly face that direction and you can move instead of turning to that direction then move.
If someone can post a script or write one for me, that would be freaking awesome.
I am learning to script but i am not capable of making new scripts yeah.

-Kenny age 14.

here is a few links to some video tutorials for Unity

Unity 3D Student - 3d Modelling (look for the about KEYS)