How do I create a new module.

I have a basic custom page, http://www.opencart.com/index.php?route ... tom%20page
But how do I add an admin area to my site so I can add other things to the layout ?

There are no template files for the admin folders.

I wish to add layouts in Admin > System > Design > Layouts. But my custom page does not show up because I do not have any files related to my page in the admin folders. What files do I need and what are their contents for a basic template that I can alter if needed.

Basically, it is described, at least for OC v.1.5.x, on many pages:
http://code.tutsplus.com/tutorials/from ... -cms-21873
https://www.google.ch/search?q=How+do+I ... n+opencart
Good Luck
Ernie

Yes, thats just it, there are loads for 1.5 but nothing I have found yet for version 2.0+