look up making a custom post type and add_submenu_page
#add_submenu_page( $parent_slug, $page_title, $menu_title, $capability, $menu_slug, $function );

I can do anything inside wp-admin, but I am not sure how I would teach someone.
Adding a menu page will let you create a page in the navigation. The page calls you function to display whatever on the page. These are php functions so the sky is the limit.

[DELETED]

[DELETED]