Now that the Office 365 SharePoint Online Public Web Site ability has been deprecated I’ve open sourced the documentation I created on it which I have placed on my docs.com site which I have embedded above and made available for download:
I also did a video tutorial on the subject which you can find here:
As some older Office 365 tenants still have the ability to work with the public web site for a limited time, hopefully this information might be of use.