Occulus Vr and Unity

Hello ,

I have made a game and I want to transform it into a VR game . I got the old Samsung Occulus Vr , the one with the touchpad (no controllers) I am trying to do it but I am having a hard time with docuemtation and tutorials as each says different thing that I can't understand.

What I need to do is basically this but in VR:

  if (Input.GetMouseButtonDown(0))
             {
                 RaycastHit hit;
                 Ray ray = Camera.main.ScreenPointToRay(Input.mousePosition);
 
                 if (Physics.Raycast(ray, out hit))
                 {
                      if (hit.transform.tag == "Mummy")
                      {
                         //do stuff here     
                      }
                    
                 }
             }

Any help please?