Hello everyone guys. In my opinion, NFT is too big hype. But in general, the idea of a marketplace is quite interesting. In general, I advise you to read this article https://4irelabs.com/articles/how-to-build-an-nft-marketplace-like-opensea/, because it just suits your request perfectly. It seems to me that you should also contact 4ire specialists to get the best and outsourced development team for you.