(Updated) How do I make a target system?

Hello, I made a script and updated it, I need to make a system to choose targets within a range, I have the whole system ready but for a single objective that when killing it keeps pointing to it, and clearly is not what I want to do, does anyone Do you know something simple about using the matrix? (That is, an automatic list with all the objectives). Thank you!

 using UnityEngine;
 using System.Collections;
 using UnityEngine.UI;
 
 public class PlayerAim : MonoBehaviour {
 
     public Transform CamaraTransform;
     public Transform Target;
     public bool LookingTarget = false;
     public GameObject Camara;
     public bool Targeting = false;
     public MonoBehaviour SmoothFllw;
     public GameObject Crosshair;
     public GameObject Player;
     public RawImage Imagen;
     public float Distancia;
 
     void Start () 
     {
     
     }
     
     void Update () 
     {       
         var distance = Vector3.Distance(Target.position, transform.position);
 
         if(LookingTarget == true)
         {
             CamaraTransform.LookAt(Target);
         }
 
         Camara = GameObject.Find ("Camera");
         SmoothFllw = Camara.GetComponent("SmoothFollow") as MonoBehaviour;
 
 
         if(Targeting == true && distance <= Distancia)
         {
             Vector3 TextoPosicion = Camera.main.WorldToScreenPoint(Target.transform.position);
             Imagen.transform.position = TextoPosicion;
             SmoothFllw.enabled = false;
 
             LookingTarget = true;
             Crosshair.SetActive(true);
             Player.gameObject.GetComponent<MouseLook>().enabled = false;
 
         }
         if(Targeting == false)
         {
             LookingTarget = false;
             SmoothFllw.enabled = true;
             Crosshair.SetActive(false);
             Player.gameObject.GetComponent<MouseLook>().enabled = true;
 
         }
     
         if(Input.GetMouseButtonDown(1))
         {
             Targeting = true;
         }
         if(Input.GetMouseButtonUp(1))
         {
             Targeting = false;
         }
     }
 }