To sell sports cards, you'll need a supply of cards, a place to sell them, and a way to price them. You should also be familiar with the sports card market and the value of different cards.
Sports card selling is a popular way to make money, but there are some potential risks to be aware of. First, the value of cards can be volatile, so you may not always make a profit. Second, you could be scammed by someone selling fake or counterfeit cards. Finally, you could be liable for taxes on your profits if you don't declare them properly. So, if you're thinking of selling sports cards, be sure to research the risks first.