After creating a new page, filling the page with structure

Your best bet is to create a new “physical page” and save it in your theme root folder as a template called something suchlike tpl_aufwind.php like this:

<?php
/*
 * Template Name: Aufwind
 *
 *
*/
?>

you will need that code above at the very top of the tpl_aufwind.php so that it shows up in wp-admin dashboard >> pages >> Page Attributes (right sidebar) >> Template

Create Your Own WordPress Template

your options then if you need to add google maps the normal way is to hardcode it in (or if you know of a plugin where you can use a shortcode try that), but if you are using shortcodes or wish to show more on the page than just the Google Maps api then add a wp loop either above or below your hardcode so at least something on the page can be edited via the admin pages panel