I need help to rotate a plane and other tips

I'm making a game like Marble, but the player doesn't move the ball, only the plane/board by rotating it. How can I do this? I've searched through this foruns for a similar answer but couldn't find. Thanks for the attention in advance.

Edit: Found a partial solution in this topic: http://answers.unity3d.com/questions/278648/how-to-rotate-a-plane-with-script.html

but the plane only rotate left or right.

here's the code

 void Update ()
     {    
        transform.Rotate((Vector3.forward * Input.GetAxis("Horizontal") * 2) + (Input.GetAxis("Vertical") * Vector3.forward * 2));        
     }

Edit 2: I've fixed the rotation, but now I need to put a limit on this rotation (so the plane don't go crazy) and attach some cubes to the plane.

Here's the code fixed:

 void Update ()
     {    
        transform.Rotate((Vector3.left * Input.GetAxis("Horizontal") * 1) + (Input.GetAxis("Vertical") * Vector3.forward * 1));        
     }