How to create a basic page
You don't set the path when creating a content type. Once you create a "basic page" content type (or use the one that comes with the "standard Install" of Drupal core), you can then create a basic page by going to node/add. Then in the vertical tabs at the bottom of the node creation page, you will find a tab called, "URL path settings". In there you can manually specify a path. If you wish to avoid having to manually adding a path for every node, use the Pathauto module.