How to rotate a spacecraft using the mouse instead of butttons?

Hello,

I'm working on a space sim at the moment, and my current controls are quite difficult to use, as I have different input pairs for Roll, Pitch and Yaw. Is there any way that I could use the mouse's movement to alter the pitch and yaw, as Pitch is up/down, and Yaw is left/right. An example of this mechanic would be No Man's Sky, and I was wondering if anyone could help me implement it, with possibly some Camera delay too. My central control script is below.

 void Start()
 {
     rigidBody = GetComponent<Rigidbody>();
     OriginalDrag = rigidBody.drag;
     OriginalAngularDrag = rigidBody.angularDrag;

     for(int i = 0; i < transform.childCount; i++)
     {
         foreach(var componentsInChild in transform.GetChild(i).GetComponentsInChildren<WheelCollider>())
         {
             componentsInChild.motorTorque = 0.18f;
         }
     }
 }

 public void Move(float rollInput, float pitchInput, float yawInput, float throttleInput, float verticalInput, bool airBrakes)
 {
     this.RollInput = rollInput;
     this.PitchInput = pitchInput;
     this.YawInput = yawInput;
     this.ThrottleInput = throttleInput;
     this.AirBrakes = airBrakes;
     this.VerticalInput = verticalInput;
     
     Throttle = Input.GetAxis("Throttle");
     ClampInput();
     CalculateRollAndPitchAngles();
     //AutoLevel();
     CalculateForwardSpeed();
     ControlThrottle();
     CalculateDrag();
     CalculateLinearForces();
     CalculateTorque();
     if(Throttle < 0.1f)
     {
         Vector3 currentVelocity = rigidBody.velocity;
         Vector3 newVelocity = currentVelocity * Time.deltaTime;
         rigidBody.velocity = currentVelocity - newVelocity;
     }
     //TPS();
 }

 void ClampInput()
 {
     RollInput = Mathf.Clamp(RollInput, -1, 1);
     PitchInput = Mathf.Clamp(PitchInput, -1, 1);
     YawInput = Mathf.Clamp(YawInput, -1, 1);
     ThrottleInput = Mathf.Clamp(ThrottleInput, 0, 1);

 }

 void CalculateRollAndPitchAngles()
 {
     Vector3 flatForward = transform.forward;
     flatForward.y = 0;

     if(flatForward.sqrMagnitude > 0)
     {
         flatForward.Normalize();
         Vector3 localFlatForward = transform.InverseTransformDirection(flatForward);
         PitchAngle = Mathf.Atan2(localFlatForward.y, localFlatForward.z);

         Vector3 flatRight = Vector3.Cross(Vector3.up, flatForward);
         Vector3 localFlatRight = transform.InverseTransformDirection(flatRight);
         RollAngle = Mathf.Atan2(localFlatRight.y, localFlatRight.x);
     }
 }
 
 void AutoLevel()
 {
     BankedTurnAmount = Mathf.Sin(RollAngle);

     if(RollInput == 0f)
     {
         RollInput = RollAngle * AutoRollLevel;
     }

     if(PitchInput == 0f)
     {
         PitchInput = -PitchAngle * AutoPitchLevel;
         PitchInput -= Mathf.Abs(BankedTurnAmount * BankedTurnAmount * AutoTurnPitch);
     }
 }
 
 void CalculateForwardSpeed()
 {
     Vector3 localVelocity = transform.InverseTransformDirection(rigidBody.velocity);
     ForwardSpeed = Mathf.Max(0, localVelocity.z * 10);
 }   
 
 void ControlThrottle()
 {
     
     if (Immobilized)
     {
         ThrottleInput = -0.5f;
     }

     ThrottleInput = Mathf.Clamp01(Throttle + ThrottleInput * Time.deltaTime * ThrottleChangeSpeed);
     EnginePower = Throttle * MaxEnginePower;

     
 }

 void CalculateDrag()
 {
     float extraDrag = rigidBody.velocity.magnitude * DragIncreaseFactor;
     rigidBody.drag = (AirBrakes ? (OriginalDrag + extraDrag) * AirBreaksEffect : OriginalDrag + extraDrag);
     rigidBody.angularDrag = OriginalAngularDrag * ForwardSpeed / 1000 + OriginalAngularDrag;
 }

 void CalculateLinearForces()
 {
     Vector3 forces = Vector3.zero;
     forces += EnginePower * transform.forward;
     forces += VerticalInput * 100 * transform.up;

     rigidBody.AddForce(forces);

 }

 void CalculateTorque()
 {
     Vector3 torque = Vector3.zero;
     torque += PitchInput * PitchEffect * transform.right;
     torque += YawInput * 100 * transform.up;
     torque += RollInput * RollEffect * transform.forward;
     torque += BankedTurnAmount * BankedTurnEffect * transform.up;
     rigidBody.AddTorque(torque * AeroFactor);
 }

 public void Immobilize()
 {
     Immobilized = true;
 }

 public void Reset()
 {
     Immobilized = false;
 }

I'm pretty new to Unity and C#, and I'd really appreciate your help. I've tried to use the Camera section in the FirstPersonController asset script, but I can't wire it all up.