AI Script Problem, Horror Game

I'm currently in the process of making a horror game with a story to it. It's not just pointless wet yourself then never touch the mouse again. It's follow the story, enjoy the motivations, then wet yourself a few times. I'm a 3D artist making the map (A replica of a few blocks of a real town located in south weber utah. Very high poly) and thats the problem. I'm missing a very important AI script. I've made my own but really first day trying scripting and im having problems with it.

 var target : Transform; //the enemy's target
 var moveSpeed = 3; //movespeed
 var stopSpeed = 0;
 var rotationSpeed = 3; //speed of turning
 
 var myTransform : Transform; //current currents transform data of this enemy
 
 function Awake()
 {
     myTransform = transform; // cach transform data for easy accessperformance
     
 }
 function Start ()
 {
     target = GameObject.FindWithTag("player").transform; //target the player
     
 }
 
 function update () {
 
     var Speed = moveSpeed;
     
     if (renderer.isVisible)
     {
     myTransform.Position += myTransform.forward * stopSpeed * Time.deltaTime;
     }
     
     if(!renderer.isVisible)
     {
     myTransform.Position += myTransform.forward * moveSpeed * Time.deltaTime;
     }
     //rotate to look at the player
     myTransform.rotation = Quaternion.Slerp(myTransform.rotation,
     Quaternion.LookRotation(target.Position - myTransform.Position), rotationSpeed*Time.deltaTime);
     
     
 }
 
 //if you are looking at the object...
 if (renderer.isVisible)
 {
 move = false;
 }
 
 //if you are NOT looking at the object...
 if(!renderer.isVisible)
 {
 move = true;
 }
 //if you are not looking at the object...
 if(move)
 {
 //make him look at the target
 transform.LookAt(target);
 //always follow the target
 myTransform.position += myTransform.position.straight * moveSpeed * Time.deltaTime;
 }
 
 //if he is 3 units away from something, move right (works if you are not looking at the object)
 if (Physics.Raycast (transform.Position.forward) && move)
 {
 Debug.Log("Something ahead, moving");
 transform.Translate(Vector3.right * 3 * Time.deltaTime);
 }

I need it to be like a slenderman sort of AI. Meaning, i need my enemy to stalk, teleport, and appear at a selected game object(e.g. behind door in a closet). My script doesn't have all i need and its junk anyways. ill just stick to modeling. I would really appreciate any help anybody can give, and if you come up with a script i;ll put your name in the credits.