Third person camera : follow and mouse wheel rotation

Hello,

I'm a beginner with C# and I try to make a Third Person camera that follow my character but also rotate around him when I click on Mouse Wheel.

Problem: I can't find a solution to do both.

This is the first version of my code. With this one, the camera follow my character and rotate, but with mouse mouvement (and i really don't like it)

 public class PlayerCamera : MonoBehaviour {
 
   public GameObject player;
   private Vector3 offset;
 
 
   [SerializeField] int rotationSpeed = 3;
   [SerializeField] bool rotationCam = true;
 
   void Start()
   {
     offset = transform.position - player.transform.position;
   }
 
 
   private void LateUpdate()
   {
     transform.position = player.transform.position + offset;
 
           if(rotationCam)
           {
             Quaternion turnAngle = Quaternion.AngleAxis(Input.GetAxis("Mouse X")
             * rotationSpeed , Vector3.up);
             offset = turnAngle * offset;
           }
 
           transform.LookAt(player.transform);
 
   }
 
 }

And I find this one somewhere here. This one is perfect to rotate camera with mouse wheel, but don't follow my character.

  using UnityEngine;
  
  public class StreetViewCamera:MonoBehaviour {
      public float speed = 3.5f;
      private float X;
      private float Y;
  
      void Update() {
          if(Input.GetMouseButton(0)) {
              transform.Rotate(new Vector3(Input.GetAxis("Mouse Y") * speed, -Input.GetAxis("Mouse X") * speed, 0));
              X = transform.rotation.eulerAngles.x;
              Y = transform.rotation.eulerAngles.y;
              transform.rotation = Quaternion.Euler(X, Y, 0);
          }
      }
  }

Any help and/or suggestions on where to find some information to do both, would be much apprecieated :)