Welcome -- cheers to our first project together! The first thing you will need to do is add a client and a user for that client. Most clients will likely only have one user -- but just in case you can add more if needed. After you have added the client and user, you can logout and login as that client to see what they will see. You can also create a demo client and user to give to trial users or potential clients.

Good luck selling, and let me know when you are ready to start the second version (to compete with One Shopping Cart for Internet Marketers!)