3D Movement with Gamepad with Input System?

This is what I did:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class playerMovement : MonoBehaviour
 {
     public CharacterController controller;
 
     public float speed = 12f;
     public float gravity = -9.81f;
     public float jumpHeight = 3f;
 
     public Transform groundCheck;
     public float groundDistance = 0.4f;
     public LayerMask groundMask;
 
     Vector3 velocity;
     bool isGrounded;
 
     // Update is called once per frame
     void Update()
     {
         isGrounded = Physics.CheckSphere(groundCheck.position, groundDistance, groundMask);
 
         if (isGrounded && velocity.y < 0)
         {
             velocity.y = -2f;
         }
 
         float x = Input.GetAxis("Horizontal");
         float z = Input.GetAxis("Vertical");
 
         Vector3 Move = transform.right * x + transform.forward * z;
 
         controller.Move(Move * speed * Time.deltaTime);
 
         if (Input.GetButtonDown("Jump") && isGrounded)
         {
             velocity.y = Mathf.Sqrt(jumpHeight * -2f * gravity);
         }
 
         velocity.y += gravity * Time.deltaTime;
 
         controller.Move(velocity * Time.deltaTime);
     }
 }
 

That was the player movement script, here is the mouse looking around script:

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 
 public class mouseLook : MonoBehaviour
 {
     public float mouseSensitivity = 100f;
 
     public Transform playerBody;
 
     float xRotation = 0f;
 
     // Start is called before the first frame update
     void Start()
     {
         Cursor.lockState = CursorLockMode.Locked;
     }
 
     // Update is called once per frame
     void Update()
     {
         float mouseX = Input.GetAxis("Mouse X") * mouseSensitivity * Time.deltaTime;
         float mouseY = Input.GetAxis("Mouse Y") * mouseSensitivity * Time.deltaTime;
 
         xRotation -= mouseY;
         if (xRotation < -90)
         {
             xRotation = -90;
         }
 
         transform.localRotation = Quaternion.Euler(xRotation, 0f, 0f);
         playerBody.Rotate(Vector3.up * mouseX);
     }
 }
 

Note: It doesn't have the mouse lock when you look up and down so you can do front flips. @jhubbard21

To all the people following my question, I figured most of it out. Below, I have my script that got it to work. Because I don't know what everyone is looking for, I put down all of the script I thought could be remotely relevant. This will allow your character to move backward, forward, left, and right at any angle the joystick points in. The character doesn't turn yet (another question I'll be asking soon), and I haven't figured out the camera rotation yet. If there are any other questions about this script, please ask in the replies. I might be able to help or clarify something.

(Sorry if my method of code organization is confusing)

 using System.Collections;
 using System.Collections.Generic;
 using UnityEngine;
 using UnityEngine.EventSystems;
 using UnityEngine.InputSystem;
 using UnityEngine.Scripting.APIUpdating;
 
 public class PlayerController : MonoBehaviour
 {
     PlayerControls controls;
 
     Vector3 Movement;
 
     void Awake()
         //Controller input roles
     {
         controls = new PlayerControls();
 
         controls.Gameplay.Movement.performed += ctx => Movement = ctx.ReadValue<Vector2>();
         controls.Gameplay.Movement.canceled += ctx => Movement = Vector3.zero;
     }
 
     //Joystick controls
     void Update()
     {
         //Character Movement
         Vector3 m = new Vector3(Movement.x, 0, Movement.y) * Time.deltaTime;
         transform.Translate(m, Space.World);
     }

 void OnEnable()
     {
         controls.Gameplay.Enable();
     }

 void OnDisable()
     {
         controls.Gameplay.Disable();
     }
 }

@jhubbard21

using System.Collections; using System.Collections.Generic; using UnityEngine; using UnityEngine.InputSystem;

public class characterMovement : MonoBehaviour { // variable to store character animator component Animator animator;

 //variables to store optimized setter/getter parameter IDs
 int isWalkingHash;
 int isRunningHash;

 //Variable to store the instance of the player input
 Playerinput input;

 //variables to store player input values
 Vector2 currentMovement;
 bool movementPressed;
 bool runPressed;

 //Awake is called when the script instance is being loaded
 void Awake()
 {
     input = new Playerinput();

     //set the player input values using listeners
     input.CharacterControls.Movement.performed += ctx =>
     {
         currentMovement = ctx.ReadValue<Vector2>();
         movementPressed = currentMovement.x != 0 || currentMovement.y != 0;
     };
     input.CharacterControls.Run.performed += ctx => runPressed = ctx.ReadValueAsButton();
 }
 // Start is called before the first frame update
 void Start()
 {
     //set animator reference
     animator = GetComponent<Animator>();

     //set the ID references
     isWalkingHash = Animator.StringToHash("isWalking");
     isRunningHash = Animator.StringToHash("isRunning");
 }

 // Update is called once per frame
 void Update()
 {
     handleMovement();
     handleRotation();
 }

 void handleRotation()
 {
     Vector3 currentPosition = transform.position;

     Vector3 newPosition = new Vector3(currentMovement.x, 0, currentMovement.y);

     Vector3 positionToLookAt = currentPosition + newPosition;
     transform.LookAt(positionToLookAt);
 }

 void handleMovement()
 {
     //get parameter values from animator
     bool isRunning = animator.GetBool(isRunningHash);
     bool isWalking = animator.GetBool(isWalkingHash);

     //start walking if movementPressed is true and not already walking
     if (movementPressed && !isWalking)
     {
         animator.SetBool(isWalkingHash, true);
     }

     //stop walking if movementPressed is false and not already walking
     if (!movementPressed && !isWalking)
     {
         animator.SetBool(isWalkingHash, false);
     }

     //start running if movementPressed  and runPressed is true and not already running
     if ((movementPressed && runPressed) && !isRunning)
     {
         animator.SetBool(isRunningHash, true);
     }

     //stop running if movementPressed or runPressed is false and already running
     if ((!movementPressed || !runPressed) && isRunning)
     {
         animator.SetBool(isRunningHash, false);
     }
 }

 void OnEnable()
 {
     //enable the character controls action map
     input.CharacterControls.Enable();
 }

 void OnDisable()
 {
     //disable the character controls action map
     input.CharacterControls.Disable();
 }

}