Page Template: Listings
By default you do not need to create a custom page to display your listings. They will automatically be located at the "slug" version of the noun you've chosen in "Appearance Customize General".
By default this will be http://yourwebsite.com/listings/ (assuming you have pretty permalinks enabled in "Settings > Permalinks). If this link leads to a 404 - Page Not Found message then please visit "Settings > Permalinks" and click "Save".
If you want to use a different slug than that of your noun you have chosen, or you want to force specific arguments in the [jobs] shortcode you do have the option to create your own page.
To create a separate listings page, visit "Pages > Add New". Simply add the [jobs] shortcode to this page. You can use either the default page template, or assign an of the "No Sidebar" page templates.