You do NOT need to own a domain prior to setting up your Book like a Boss account. When you start to set up your account with us we will ask you to select what your BLAB domain will be. This is usually your name, brand name or company name. It will appear as the URL www.book.me/XXXXXX or www.book.us/XXXXX
Each appointment, service, product, event or other custom page will have its own URL string and will appear as www.book.me/XXXXX/Your product ( example)
If you already own a domain you may choose to use your custom domain with your BLAB account but this is not a necessary step prior to setting up your account.
Hope that helps!