Not to hijack this thread, but I did an entire YT video for this similar subject below:
https://www.youtube.com/watch?v=QYsMIwsfLSI&t=1416s
You are free to watch and DM me basic questions. I think I covered all your questions in the video and a follow up I did last night night, this is not my channel and I make $0 profit by you watching it.
Yes, I am a CPA. Yes, I am willing to state in a public board that I do not report every penny of sales from eBay (although I am way below the $20k/200 threshold).