The traditional hierarchical structure is a good starting point. A few simple but meaningful icons can help people navigate the pages. One at least for the home page is most useful. Provide search facilities if the site is complex. This should be a small icon, or a hyperlink, or a menu bar, at the bottom of the page.
Testing Validate the HTML .
Validated HTML documents will become a key aspect of Web life to ensure document portability. Note that some programs may have difficulty if the HTML is incorrect. There is a validation button at the bottom of most WDVL pages. Check the links . Check them periodically.