I am trying to access the spotlight to turn Light.enabled = true or = false, how can I do that given that I have access to the gameObject Flashlight?

Light lightComponent = flashlightGameObject.transform.Find(“Spotlight”).GetComponent();
lightComponent.enabled = true ;

You could do

Light light = flashLightGameObject.GetComponentInChildren<Light>();

if(light != null)
{
    light.enabled = true;
}

This way its only guaranteed to get a light in the children, and it will avoid null reference errors.