To learn more about what you can do with Pages, visit Understanding Pages.
Within the Pages settings, you can define which page templates are available by default as soon as your Module item is created.
To proceed with Default Pages, select a Page template (either one you've created in your Template Library (Admin Settings > Templates) or a Qatalog-created template). Once you've saved, all future Module items will have this/these Pages automatically created and associated with a Module item on creation.
Adding a Default Page in Module Settings
How it looks when a Page is automatically created on item creation thanks to Default Pages.