Pick the one that matches your situation. We'll branch the rest of the wizard accordingly — either help you pick a brand-new name, or pull the public WHOIS record for the one you already own.
A domain name is the address people type into a browser to find your business — like weyug.com or amazon.in. It's the first thing your customers see, and the line you put on your business card. If you've never registered one, pick No and we'll find you a great one.