Once you have a MetaMask wallet created, you’ll be able to create your own NFTs.
Navigate to opensea.io and click the Create button in the menu bar. Now you can connect your MetaMask wallet with OpenSea and get to work.
Create a name for your NFT collection, then click the Add New Item button. You are now ready to upload the file you want to tokenize and give it certain properties and stats to distinguish it from the rest of your collection.
Determine how many copies you want of each item, then set a retail price.