How can I properly integrate rotation to a character?

I've got this basic movement script

 var speed = 6.0;
   
 private var moveDirection = Vector3.zero;
 
 function FixedUpdate () {
         moveDirection = Vector3(0, 0, Input.GetAxis("Vertical"));
         moveDirection = transform.TransformDirection(moveDirection);
         moveDirection *= speed;
             
         var controller : CharacterController = GetComponent(CharacterController);
         var flags = controller.Move(moveDirection * Time.deltaTime);
     }
     
     @script RequireComponent(CharacterController)

I've been trying to add rotation by myself to it and I'm kind of stuck here, and I checked the documentation and I got it to rotate but it would not rotate 360 degrees, at certain point it just stopped, I looked on other scripts and what I found was this:

     var controller : CharacterController = GetComponent(CharacterController);
     var forward = transform.TransformDirection(Vector3.forward);
     var curSpeed = speed * Input.GetAxis ("Vertical");
     controller.SimpleMove(forward * curSpeed);

it kind of worked but it didn't integrate that well with the other part of the code, so my question is, how can I integrate rotation to it, and besides that, a good tutorial about movement for unity would be nice, thanks for reading.