Not sure the total value of what you are planning to sell, but as the seller you are on the hook for insuring that items are delivered, and therefore the insurance. If this is going to be a significant amount of stuff, the insurance with the shipper item by item will add up quickly. Instead, you might insure your whole collection with Collect Insure (
https://collectinsure.com/), which then covers insurance on shipping as long as you follow their rules on how you ship items based on their value.
Paypal let's you accept credit card payments if you want to. It costs either you or the buyer 3%, so no worries there.
For BST I like combined threads as it is annoying to see a bunch of individual listings at the same time for other sellers - it pushes everyone else's stuff way down the board.