I need help creating a ZombieAI for my Walking Dead Game

I want the zombie ai that would go after the sound of a gunshot and not follow the player and I want it to go after the player when the player is in the zombies field of view. I also want the zombie to go after many people with the player tag. If the player goes into a house I want the zombie to go after the door even if the player goes out the other way. I want the zombie to DETROY the door. I also want the zombie to follow other zombies that have a target to go after. If not then they roam slowly. Here is what I have so far.

var door : Transform; var target : Transform; var myTransform : Transform; var moveSpeed = 2; var rotationSpeed = 4 var height = 0; var hasTarget = false; var rayDistance : float = 10.0; var timeToStopAttacking : float; var fieldOfView : float = 70; var timer : float = 10.0; var distanceToEnemy;

function Awake () {

 myTransform = transform;

}

function Update () {

 If((Input.GetButtonUp("Fire1"))  &&   (distanceToEnemy <= rayDistance * 1.5 )) {

     hasTarget = true;

}

 target = GameObject.FindWithTag("Player").transform;
 distanceToEnemy = Vector3(myTransform.position, target.position);
 rayDirection = target.position;


 //Raycast
 var hit : RaycastHit;
 
 if((Vector3.Angle(rayDirection, transform.forward) < fieldOfView){
     if(Physics.Raycast(myTransform.position, myTransform.forward, hit, rayDistance)){
         if(hit.transform.tag == "Player") &&  (hit.transform.tag != "Wall") && (hit.transform.tag != "Door")) {
             hasTarget = true;
          }
     }
  }

   // GOING AFTER ITS TARGET
   if(hasTarget) {
   
       var lookDir = target.position - myTransform.position
       var lookDir.y = height; // Height is the height difference
        myTransform.rotation = Quaternion.Slerp(myTransform.rotation, Quaternion.LookRotation(lookDir),  rotationSpeed*Time.deltaTime);
       myTransform.position += myTransform.forward * moveSpeed Time.deltaTime;

}

}