A few questions from a newbie.

A few questions from a newbie.

I am creating a wiki for a small computer training company.  We teach Word, Excel, PowerPoint, etc .  I've figured out that each customer needs its own workspace.   I want a button for each application to appear across the top of the page.

...like here on the Invoice Wiki.

Or this page? 



http://www.niskypto.org





And how do I change the Navigation pane to look like this?


Or this?



Do I need CSS style sheets to do any of these things?  If yes, any recommended sources?

Thanks,
--DJ