Cannot get WordPress version of site up.

I have my site hosted with bluehost.  Had a company design my site... they utilized WP.  I am no longer using that company.

All was well... then I decided to try and change the theme.  Doing this caused my site to open with the blank template.

So, what I did was to slap together a php site to use as a temporary fix.

Here's the issue:

I went in and did something so that bluehost/Apache/whatever, would pull up my "slapped together" site as opposed to the WP site.  I cannot remember this "something" that I did.  I do know that whatever I did I did NOT just haphazardly do.  In other words I would have commented out an original line if I had to modify one or I would have changed a file to ".old" if I had to replace one, etc.

Whatever I did was a fairly simply thing.  By this I mean that it wasn't like I had to modify more than one line or replace one file.

I'm sure that if I installed WordPress onto my own server, there would be some kind of setting that I'd have to change in Apache or somewhere to make Apache serve up a WordPress site.  The .htaccess file doesn't look to be the answer.

Any thoughts?  What I don't want to do is something so drastic that I lose all of my old stuff (66 pages).  When I switched to the new template, as stated earlier, I was left with a blank shell when viewed from the web although through the WP admin console I could still see and edit the old pages... the old pages just didn't appear in the new template.

So, I'm trying to just get back to the blank template so I can learn how to incorporate my old pages/data.