Web sites that we provide links to have been screened. Pages have been organized and structured to make it easy to find useful information. Using a flowchart or outline, describe the structure and the links between the various parts. Plan your first page. Plan another page, continue.
Web sites are always works in progress.
Although you want to have a good working web site when you invite others to view it, you will continue to add, subtract and improve your site. Too many people think that once they have created the first few pages that they are done. As you plan you should also think about how you plan to update and maintain the material.