You'll need a photo of you, your storefront, or your logo, some words about what you are doing or selling, your goal and your history, and an email address (which I can help you set up if you want). If you want a custom domain, and do not have it registered yet, see if what you want is available (just type it in to a browser and see what comes up). I will handle the actual registration if you want (if not, I'll need access to the account with your registrar to change setting so it points to your page. Takes about a week.