After you have signed up with WSI and paid for your site, WSI will send you a link and a password (usually within one business day). With this you are ready to build your site.
Your next task is deciding on your beginning template design. There are more than 1000 to choose from. Not to worry, if you decide down the road that you don't like the way your selection is working, you can always select a new design without deleting your content. ASAP is flexible and powerful!
Also note that you are given options to change images in the chosen template, upload your own business logo etc.