that info helps a lot. First look for a FB group that covers that interest and do sell as sets. as long as it's about 20% under retail, or a little less than the best sale price you've seen they will probably go like hot cakes.
Shipping can be tricky now because it's by zip zone again, so someone in your state will pay less shipping that someone across the country.
When I put stuff up for sale on my regional FB sales group, I choose the price I want, add shipping and list "with free shipping"
WAY less complicated in so many ways. Unless you use the free Priority Shipping boxes, chose the size box from your pile that closest fits the ruler set, can be padded, but no bigger than needed. You are charged shipping by weight And size, so a great big box can add $$ for shipping air.
Best wishes, sounds like a great plan going forward, and Way better than family giving them away when you are gone.
You could even start here on our sale page, I've sold and gifted and bought lots of stuff successfully here. Just take plenty of pictures, and they don't have to be arty like Etsy. And you won't pay 15-20% commission!