Panels default content when creating a new page
You want to create a new page by cloning (AKA copying) the one you've already made with all your content/layout/settings chosen.

Under admin/structure/pages, navigate to the Edit form for the page you've already created and would like to replicate (See screenshot).



Then, click on the Clone button on the top, right-hand menu of the page's Edit form (See screenshot).



Then just follow the wizard's instructions for cloning the page. Once you've cloned the page, you'll have a brand new page with all the same content, layout, and settings as the previous one.