Do you know what circuit breaker the light switch is on?
What is your skill level working with residential electricity?
If you do know for sure what circuit breaker the switch is on do you feel confident enough to shut the power off at the breaker and then pull the switch out from the wall and take pictures of the switch and the wiring in the switch box. Do not remove any wires from the switch.
If you can do the above then take a few clear pictures of the front and back of the switch and the wires in the box but only after you are sure the power is off to that switch. Post the pictures here so we have a starting point.
Note: You must shut off the correct circuit breaker first before attempting any of the above.