To get your design listed on NFT Nation, you need to have at least one sale. This can be done by promoting your creation on social media using the personal link that is generated once you have created a design. If someone buys it, you will automatically qualify for NFT Nation and can create as many designs as you want to list on there. The other way to qualify is by buying your own creation. Either way, you need one sale to start listing your creations on NFT Nation. This helps to ensure that only high quality designs are listed and to prevent the platform from being spammed with thousands of experimental creations that no one will buy.