Rotating the game object with direction of mouse move

Hello I am preparing a 3D isometric game I need to move and rotate my 3d game object. I can move my object on a fixed y position but I need to rotate my objects With the direction of mouse move here is the code that I have;

 using UnityEngine;
 using System.Collections;
 
 
 public class Drag : MonoBehaviour
 {
 
     private Vector3 screenPoint;
     private Vector3 offset;
 
     void Update()
     {
         if (Input.GetMouseButton(0))
         {
             Plane plane = new Plane(Vector3.up, new Vector3(0, 17, 0));
             Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
             float distance;
             if (plane.Raycast(ray, out distance))
             {
                 transform.position = ray.GetPoint(distance);
             }
         }
         
     }
 
     void OnMouseDown()
     {
         Vector3 mouse = new Vector3(Input.mousePosition.x, Input.mousePosition.y, Input.mousePosition.z);
         offset = gameObject.transform.position - Camera.main.ScreenToWorldPoint(mouse);       
     }
 
     void OnMouseDrag()
     {
         Vector3 curScreenPoint = new Vector3(Input.mousePosition.x, Input.mousePosition.y, Input.mousePosition.z);
         Vector3 curPosition = Camera.main.ScreenToWorldPoint(curScreenPoint) + offset;
         curPosition.y = 2f;
         transform.position = curPosition;
     }
 
 }

Thanks for resolving it.