It sounds like you're just starting out in ez publish and to answer your question properly would be quite long winded. I'd recommend you do the building an ez publish site tutorial, that'll help you understand a little better how ez works.
The Corporate "template" is just an example of what you can do with ez, you're much better off designing your own site from scratch and learning as you go along.
Followed your advice and did the tutorials. I sorta understand how the whole template thing works. I realized I liked the corporate template look and would just like to add a gallery to it.
So I created classes for both the album and gallery exactly as the gallery template. Then created templates for both album.tpl and gallery.tpl. However nothing shows up when i created the content. Any other suggestions will be helpful. Or confirmation that i am on the right track.
Have you remembered to set the overrides, i.e your new classes uses the correct templates. Secondly, if you made new classes you must also check the permissions, i.e. can anonymous user view the new classes? By default he can NOT VIEW THEM. Login into admin and go to user, then check anonymous role and add your new classes.