I would like to change the default order of the description above the category images to be the opposite. Please can you point me in the right direction for the files in Virtuemart 2.0
Edit the file components/com_virtuemart/views/virtuemart/tmpl/default.php and use the edited file as a template override.
http://docs.virtuemart.net/tutorials/33-templating-layouts.html and http://www.ostraining.com/blog/joomla/overrides