Ebay

I am a single taxpayer but this year I am caught up in declare income over 600 from selling on eBay. Which tax form would I use in 2022. I am an individual seller on eBay not business using their outlet to sell stuff I already own. I have a full time job. I haven't made any profit on items I sell. The items I sell are mostly coins I own. Do I really have to pay an income tax on items I bought with money the government already taxed from my job.