Before setting up naming structure, have you done keyword research, mapped out the content to what pages you want rank for what key words? Implement this, add content and deal with on-page issues as a first pass. After making these changes, and seeing what difference this makes if any in rankings.
I would move to consider changing Urls and URL structure. etc. Here is a good post from seomoz to learn about Redirections and URL Structure.
I hope this helps you out.