66 Dart Trim & Parts

Definitely, Early A body stuff is getting harder to find. I did the same thing for a friend down the block, he had quite a bit of early A and 273 parts.
It can be work finding boxes and packaging for the larger stuff, depends on how much effort you are willing to put into the process.
Going to need some good packaging tape and maybe bubble wrap to protect the sensitive stuff. Smaller stuff can go in a flat rate box. Once you get the parts inventoried, it tends to go smoother. You can use the search here for pricing guidelines.
Some things I sold as "shipping included", if its priced fair, they move real quick. As the Paypal account grows that will motivate you.
One thing that helped me get an idea on shipping was taking the part in an open box to a UPS and USPS offices (big price differences at times). I would get a quote using the furthest zip from me (lower 48) to see what maximum pricing could potentially be, then I had a ballpark price I could live with, it's hard to get burned that way.
Thanks for trying to pass these items on.
Good luck.