Project From Existing Site

I'm running into some trouble figuring out how to create a 'project'
from an existing asp application.

The ASP app was written entirely with plain text editors. I would
like to set up debugging for it, but it seems that in order to debug,
I must have a 'projec

I cannot figure out how one might go about this task. The project is
rather large (180K lines, and a few hundred files in many different
sub-dirs), and I have been playing & researching for about 4 hours
now, and I can't figure it out.

Can anyone make a suggestion as to what I must do to get something
going (preferably vs2003, but I have VID also)