2D Bullet Not Working

I have a 2D platformer and am using C#. And I'm trying to shoot my bullet prefab out of my gun. So basically, when I shoot my gun the bullet spawns but doesn't move, it gets stuck in mid-air. And second the bullet sprite wont flip to go in the direction I shoot it, it only spawns in one direction. So my entire script that goes on my bullet prefab doesn't work. And one of the reasons is because I have a reference problem, I don't have a bullet prefab in my inspector (when I did, the bullet would fly off, it kind of worked. But also the bullet would move in the direction I would move, if I shot right and then walked left, the bullet would change directions and travel left). So my reference to the script for the bullet I have on a script attached to my player says that its null because it cant find the prefab or whatever. I don't know what to do, I've given up, I've tried everything... Please help.

SCRIPT ATTACHED TO PLAYER:

 public class Glock18 : MonoBehaviour {
 
     public float fireSpeed = 0f;
     public float fireRate = 0f;
     public float damage = 10f;
     public LayerMask whatToHit;
 
     public Transform firePoint;
     public Transform bulletTrail;
 
     private WeaponPickUp weaponPickUp;
     private BulletTrail bulletScript;
 
     void Awake()
     {
         weaponPickUp = transform.root.GetComponent<WeaponPickUp>();
         bulletScript = transform.GetComponent<BulletTrail>();
     }
 
     void Update()
     {
         if (weaponPickUp.glockE == true)
         {
                 if (fireRate == 1 &&  Input.GetButtonDown("Fire1") || Input.GetKeyDown(KeyCode.L))
                 {
                 Debug.Log("is bulletScript null? " + (bulletScript == null));
                 Shoot();
                 }
         }
     }
 
     void Shoot()
     {
         Vector2 firePointPosition = new Vector2(firePoint.position.x, firePoint.position.y);
         RaycastHit2D hit = Physics2D.Raycast(firePointPosition, firePointPosition, 10, whatToHit);
         Effect();
     }
 
     void Effect()
     {
         if (bulletScript)
         {
             Debug.Log("Move");
             bulletScript.GetComponent<BulletTrail>().Move();
         }
         Instantiate(bulletTrail, firePoint.position, firePoint.rotation);
     }
 }

SCRIPT ATTACHED TO BULLET:

 public class BulletTrail : MonoBehaviour {
 
     public int moveSpeed = 0;
     public bool startingRight = true;
 
     private PlayerController playerController;
 
     void Awake()
     {
         playerController = GameObject.FindObjectOfType<PlayerController>();
     }
 
     void Start()
     {
         if (playerController.facingRight)
         {
             startingRight = true;
         }
         else if (!playerController.facingRight)
         {
             startingRight = false;
         }
     }
 
     public void Move()
     {
         
             if (!playerController.facingRight)
             {
             MoveLeft();
             }
             else if (playerController.facingRight)
             {
             MoveRight();
             }
     }
 
     void MoveLeft()
     {
         if (startingRight)
         {
             Debug.Log("FlipL");
             Flip();
         }
             gameObject.GetComponent<Rigidbody2D>().velocity = new Vector2(Time.deltaTime * moveSpeed * -50, GetComponent<Rigidbody2D>().velocity.y);
             Destroy(gameObject, 1);
     }
 
     void MoveRight()
     {
         if (!startingRight)
         {
             Debug.Log("FlipR");
             Flip();
         }
             gameObject.GetComponent<Rigidbody2D>().velocity = new Vector2(Time.deltaTime * moveSpeed * 50, GetComponent<Rigidbody2D>().velocity.y);
             Destroy(gameObject, 1);
     }
 
     void Flip()
     {
         startingRight = !startingRight;
         Vector3 scale = transform.localScale;
         scale.x *= -1;
         transform.localScale = scale;
     }
 }