How do I hunt a Generic listing?

Hello! I’m pretty new to Amazon FBA and I was thinking of selling non-branded paper liners. I was just wondering which one would be better. Creating a new listing from scratch or listing on someone else’s generic listing. As I’m new, I don’t want to take much risk and ready to settle for low profits. First of all, I needed suggestion on if I should use someone else’s generic listing to sell my product or make my own listing from scratch. Creating a new listing would be more risky imo so I was thinking of using some generic listing to start off. But I was not being able to find any good generic listing. Is there any way to hunt a good listing? Is there any other safe option for me to start on Amazon? Any help would be much appreciated!