I created a new content element: how do I print it out?
Your question hints that you're not quite yet understanding some of the basics of the Drupal CMS. I'd recommend you do a little reading about nodes, content types and paths.

The page.tpl.php template is the master page template for your entire theme. That means every page output regardless of node type or non-node page altogether.

Your node.tpl.php template is the template for specific nodes. You can create node-MYTPE.tpl.php to control a specific node type.

For further details, see Theming Drupal 6 and 7, and Drupal 6 Template Suggestions.