Do you have the stETH token imported to MetaMask? You should see a stETH balance. If not, you need to add it to your token list.

I guess I would start with why. Seriously. Why an NFT marketplace? If you can’t explain the “why” it’s not going anywhere. NFT marketplaces already exist. So you’ll also want to answer why your marketplace is better than what is already there. That’s not to say you can’t built one; Target and Walmart coexist. But you’re starting from scratch and OpenSea has been around for years. Why do you want to compete with them? You’re looking at pouring a lot of time, effort, and money into launching a project against a large, successful competitor. Why do that?