How can I create a page as a draft from my plugin?

You can use the function wp_insert_post for this http://codex.wordpress.org/Function_Reference/wp_insert_post

$my_post = array(
   'post_title' => $title,
   'post_content' => $content,
   'post_status' => 'draft',
   'post_type' => 'page',
   'post_author' => $author
);

wp_insert_post( $my_post );

then you can use wp_mail(); to notify someone. http://codex.wordpress.org/Function_Reference/wp_mail