Third person camera xna

Third person camera xna

I'm trying to create a third person camera in my XNA game. I'm able to move the model I have and the camera at the same time, although the camera is not "following" the model. The model moves faster than the camera. Ultimately, I want the camera to rotate with the model with the left and right keys, and move the model with forward and back.
This is in my update method
    if (keyState.IsKeyDown(Keys.D))
        {
            camera.Rotation = MathHelper.WrapAngle(camera.Rotation - (rotateScale * elapsed));
        }

        if (keyState.IsKeyDown(Keys.A))
        {
            camera.Rotation = MathHelper.WrapAngle(camera.Rotation + (rotateScale * elapsed));
        }

        if (keyState.IsKeyDown(Keys.W))
        {
            camera.MoveForward(moveScale * elapsed);
            player.Position += new Vector3(0.1f, 0f, 0f);
        }

        if (keyState.IsKeyDown(Keys.S))
        {
            camera.MoveForward(-moveScale * elapsed);
            player.Position += new Vector3(-0.1f, 0f, 0f);
        }
player is the model I'm using. Currently the A and D keys don't do anything with the model.
    public class Camera
{
    private Vector3 position = Vector3.Zero;
    private Vector3 lookAt;
    private Vector3 baseCameraReference = new Vector3(0, 0, 1);

    private bool needViewResync = true;

    private float rotation;

    public Matrix Projection { get; protected set; }
    private Matrix cachedViewMatrix;

    public Vector3 Position
    {
        get
        {
            return position;
        }

        set
        {
            position = value;
            UpdateLookAt();
        }
    }

    public float Rotation
    {
        get
        {
            return rotation;
        }

        set
        {
            rotation = value;
            UpdateLookAt();
        }
    }

    public Matrix View
    {
        get
        {
            if (needViewResync)
                cachedViewMatrix = Matrix.CreateLookAt(Position, lookAt, Vector3.Up);

            return cachedViewMatrix;
        }
    }

    public Camera(Vector3 position, float rotation, float aspectRatio, float nearClip, float farClip)
    {
        Projection = Matrix.CreatePerspectiveFieldOfView(MathHelper.PiOver4, aspectRatio, nearClip, farClip);
        MoveTo(position, rotation);


    }

    private void UpdateLookAt()
    {
        Matrix rotationMatrix = Matrix.CreateRotationY(rotation);

        Vector3 lookAtOffset = Vector3.Transform(baseCameraReference, rotationMatrix);
        lookAt = position + lookAtOffset;
        needViewResync = true;
    }

    private void MoveTo(Vector3 position, float rotation)
    {
        this.position = position;
        this.rotation = rotation;
        UpdateLookAt();
    }

    public Vector3 PreviewMove(float scale)
    {
        Matrix rotate = Matrix.CreateRotationY(rotation);
        Vector3 forward = new Vector3(0, 0, scale);
        forward = Vector3.Transform(forward, rotate);
        return (position + forward);
    }

    public void MoveForward(float scale)
    {
        MoveTo(PreviewMove(scale), rotation);
    }
}
I also want to offset the camera for obvious reason, but changing the values in the varia