Getting Transform position using mouse position

Look at the doc for further information about Input.mousePosition and Raycast (C#). You want something like this:

     Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
     Physics.Raycast (ray, out hit);

hit.transform is your GameObject transform

This is what your looking for, this is the best way ive found from searching and seeing it in tutorials.. hope this helps

 Camera.ScreenPointToRay
 ScreenPointToRay(position: Vector3): Ray;
 Description
 
 Returns a ray going from camera through a screen point.
 Resulting ray is in world space, starting on the near plane of the camera and going through position's (x,y) pixel coordinates on the screen (position.z is ignored).
 
 Screenspace is defined in pixels. The bottom-left of the screen is (0,0); the right-top is (pixelWidth,pixelHeight).
 
     // Draws a line in the scene view going through a point 200 pixels
     // from the lower-left corner of the screen
     function Update () {
         var ray : Ray = camera.ScreenPointToRay (Vector3(200,200,0));
         Debug.DrawRay (ray.origin, ray.direction * 10, Color.yellow);
     }
 

For the clicking part, you would want to use

 function OnMouseDown () {
 
 }

What do you mean by 'display'?

If you want to find the position of the mouse, you'd have to attach the following to the camera:

 static var mousepos : Vector3; //this is going to be the position of the mouse
 
 function Update ()  //happens every frame 
 {
     var ray = Camera.main.ScreenPointToRay (Input.mousePosition);  //making ray point to mouse (invisible)
     var hit : RaycastHit;
     if (Physics.Raycast (ray, hit,1000))
     {
         mousepos = hit.point;
     }
 }

I'll assume by 'display', you mean print. So you'd have to do

 function OnMouseDown(0){  //0 means left click
 print(mousepos);
 }

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