Adding "Page Editor" content in to a template

I've been trying to build a page template which was fullscreen, used the default menu on the theme, and which would allow me to use the page editor to write in content (html/css/text and so forth to determine the content of the page.

I have built a template which generates the menu (though it is hard-coded so I would like some way for it to pull the menu dynamically but this is secondary to the rest of this post)

Here is what the site currently looks like:

As you can see I got the menu working but I now need the contents of the page editor screen to fill in beneath it - any idea how to accomplish that?

Here is the code I've written:

Any tips or advice would be appreciated as this is the first template I've worked with - I'm also always available by chat or skype if anything like that would be beneficial. Thanks!