Choose a domain.
First, you’re going to need the right domain. Something that tells the world what you’re all about.
Pick a design.
Next you’ll need a design that really puts your vision on display. There are literally thousands of these things.
Set up a store.
You’re also going to want to set up a store to sell all sorts of stuff in all sorts of sizes. Tiny memorabilia, tiny sandwiches, or normal-sized novelty socks.