How to play nfts via contract created in polygon in opensea


I created a smart contract on red epolygon through opensea, but I don't know how to play my nfts on this contract.

I researched a little and understood the pinata concept, and I would also like to know how and where I put the generated pinata code in my nfts that I will upload.

I would like to know how to upload an entire collection automatically, pulling the individual data of each item. thanks.