Thanks for your work preparing these materials. Sending the link to my son. Philosophy is not included in his curriculum at all.
Harry Stottlemeier's Discovery (free PDF at the top right of this page: https://eric.ed.gov/?id=ED103298)
Sophie's World: https://www.amazon.com/Sophies-World-History-Philosophy-Clas...
The Fallacy Detective: https://www.amazon.com/Fallacy-Detective-Thirty-Eight-Recogn...
These books would provide a better introduction to philosophy in general, than reading about random topics in philosophy.