Need help making form work after upgrade

I’ve recently upgraded from 1.2 to 1.5. The folder structure, as you know, is quite different: content is now organized into pages and themes and such.

On my pre-upgrade site, I had a form that would allow a user to enter their email address, then send a pre-written letter to an address determined by me. My previous web admin set this up so that I could enter the letter text from an admin page, and users could send it from the user interface.

All of the files necessary for doing this were in the ../blog/letter directory. By linking to ..//myurl/letter, I could easily send users to the letter-writing tool.

With 1.5, though, I can’t figure out how to make this form active. My first question is, where do I put the directory? Simply linking to it results in an error, but it’s possible that I haven’t put it in its rightful place within the WordPress structure.

Second question, do I need to create a ‘page’ out of the content? Problem here is that there are several php documents that made up this form (index.php, content.php, letter-IPtest.php, results.php…). I don’t know how to combine them into a ‘page’ in 1.5.

Did I mention that I know next to nothing about php?

Is anyone willing to help me figure this out?

Thanks much.