InstantiateBulletsShooting.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

[RequireComponent(typeof(Rigidbody))]
public class BulletMovement : MonoBehaviour
{
    [SerializeField] private Rigidbody _prefab;
    [SerializeField] private float _speed;
    [SerializeField] private float _timeWaitShooting;
    [SerializeField] private Transform _objectToShoot;

    private Coroutine _coroutine;

    private void Start()
    {
        if (_coroutine != null)
            StopCoroutine(_coroutine);

        _coroutine = StartCoroutine(ShootingWorker());
    }

    private IEnumerator ShootingWorker()
    {
        var waitForSeconds = new WaitForSeconds(_timeWaitShooting);

        while (true)
        {
            var direction = (_objectToShoot.position - transform.position).normalized;
            var newBullet = Instantiate(_prefab, transform.position + direction, Quaternion.identity);
            newBullet.transform.up = direction;
            newBullet.velocity = direction * _speed;
            yield return waitForSeconds;
        }
    }
}