How can I adapt my movement from WSAD to mouse click and hold?

Hello, I am a beginner and still learning, I took the Unity’s Roll-a-ball beginners tutorial and after I understood the class I tried to challenge myself with trying to implement different features in the game such as Timer, Score and Interactive UI. Now I am trying to work on movement by changing it from the normal Inputs (WSAD or Arrows) into a Mouse0 click and hold.

I’ve seen some documentation and read about Nav-Mesh configure, but I can’t implement those steps properly.

The 2 scripts I am using are:


using UnityEngine;
using UnityEngine.UI;

public class PlayerController : MonoBehaviour
{

public float speed;
public Text countText;
public Text winText;

private Rigidbody rb;
private int count;

void Start()
{
    rb = GetComponent<Rigidbody>();
    count = 0;
    SetCountText();
    winText.text = "";
}

void FixedUpdate()
{
    float moveHorizontal = Input.GetAxis("Horizontal");
    float moveVertical = Input.GetAxis("Vertical");

    Vector3 movement = new Vector3(moveHorizontal, 0.0f, moveVertical);

    rb.AddForce(movement * speed);
}

void OnTriggerEnter(Collider other)
{
    if (other.gameObject.CompareTag("Pick Up"))
    {
        other.gameObject.SetActive(false);
        count = count + 1;
        SetCountText();
    }
}

void SetCountText()
{
    countText.text = "Count: " + count.ToString();
    if (count >= 14)
    {
        GameObject.Find("Player").SendMessage("Finish");
        winText.text = "You Win!";
    }
}

}

and

using UnityEngine;

public class CameraController : MonoBehaviour
{

public GameObject player;

private Vector3 offset;

// Use this for initialization
void Start()
{
    offset = transform.position - player.transform.position;
}

// Update is called once per frame
void LateUpdate()
{
    transform.position = player.transform.position + offset;
}

}


That last issue I was facing with the way I was trying to Script was that the sphere dragged to the place I clicked instead of following to the place I was holding down the mouse button. I also want the sphere to roll over and not to drag.

Thank you for your patience and time,
Best Regards,
VRS

Anyone got answer for this?
Thank you