How to move a Sphere using physics

Hi!, Im new to Unity and have some experience with programing on calculators, so i decided to start by move a sphere with physics sounded simple enough well it wasnt, been getting error after error and after reading a lot i just cant solve it.

My curent problems are the following:

And my code looks like this:

 using UnityEngine;
 using System.Collections;
 
 public class PlayerControler : MonoBehaviour 
 {
     public float speed;
 
 
     void Start();
     {
          Rigidbody sphere = GetComponent<Rigidbody>();
         Vector3 movement = new Vector3 (moveHorizontal, 0.0f, moveVertical);
     }
     
     void FixedUpdate ();
     {
         float moveHorizontal = Input.GetAxis ("Horizontal");
         float moveVertical = Input.GetAxis ("Vertical");
         
         Sphere.Rigidbody.AddForce(movement * speed * Time.deltatime);
     
     }
 }

Can anyone please help me? (btw escuse me if i have bad grammar or any other problem in my writting)