How to first edit in local Wordpress editor on page and the add code?

I started a local WordPress site using DesktopServer. (Atom for coding). And I want to start creating the new website by first creating a "page" in local WordPress and creating a basic layout, and then to find the file and edit it in my code editor.

BUT I can't find the file of the new page I created (don't even know what it would be named) in the folder where my local Wordpress installation is. How can I find it? Or if it does not sync like that, how can I syncronize it?

Any answears would be much appreciated!