How to do mouse based 3rd person flying?

Unity Engine
1

Hellooo
How would I go about writing a C# code to control a spaceship that turns with the mouse? The code I’m using kinda works but as soon as I attach the camera to the ship it goes heywire. And it doesn’t really turn properly in the 1st place.
Im not really aiming for realism I just need to be able to accelerate and boost and have the speed drop when not pressing the forward key. Many Thanks!

using UnityEngine;
using System.Collections;

public class FlightScript : MonoBehaviour {
   
    public float AmbientSpeed = 100.0f;

    public float RotationSpeed = 100.0f;
    private float rSpeed = 1.0f;
    private Vector3 MousePosition;

   

    public float TurningSpeed = 100;
    Vector3 LookAtPos;
    Vector3 SmoothedLookAtPos;
    public float ForwardSpeed = 100;
    void Update()
    {
        //Look At the Mouse
        LookAtPos = Camera.main.ScreenToWorldPoint(new Vector3(Input.mousePosition.x, Input.mousePosition.y, 100));
        SmoothedLookAtPos = Vector3.Lerp(SmoothedLookAtPos, LookAtPos, Time.deltaTime * 5);
        transform.LookAt(SmoothedLookAtPos);
        //Move forward (you could use a Rigidbody)
      
    }

   
}
2

something like the flight mechanics in both of the battlefront games. Anyone?