How can I make a custom post type that loops pages in a new dashboard page, each single page is a new dashboard page (all within the back-end)?

WordPress isn’t built with your idea in mind. That being said, add_menu_page on the WordPress Codex shows how to create an admin top-level menu page, i.e., a menu item within the left column of the admin section. add_submenu_page shows how to create submenus of top-level menu items.

You could create a plugin, and add menu/submenu items. Creating a plugin, in and of itself, is exceedingly simple:

<?php
// Plugin Name: My Cool Plugin

Upload that to your wp-content/plugins/your-plugin-directory directory, that’s all it takes. It’s a little more involved to create the menu/submenu items, but those links are a good place to start. But, there’s no built-in functionality that I’m aware of that will allow you to easily do what you want. A ready-made plugin might exist, but I haven’t searched.

BTW, custom post types wouldn’t figure into the equation, those are for front-end only.

Edit

WP Help is a plugin that might do the trick.

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