Controller script

Hi, is there anyone who would like to share some scripting skills..?
I'm looking for a 1st person controller/mouse look where an arrow or hand becomes visible only when center screen (where also the arrow/hand is placed) gets close to anything clickable (buttons etc).
Appreciate help of any kind!

 

Do a Raycast from the center of the screen.

http://unity3d.com/learn/tutorials/modules/beginner/physics/raycasting
http://docs.unity3d.com/ScriptReference/Physics.Raycast.html

Check the tag of the gameObject that the Raycast Hit.

http://docs.unity3d.com/Manual/Tags.html
http://docs.unity3d.com/ScriptReference/GameObject-tag.html
http://docs.unity3d.com/ScriptReference/RaycastHit.html