using biztalk web service - golddo

A couple questions at the end about publishing/using web service in BizTalk.

My requirements seem super-simple: create a web service which will receive
an XML document and FTP it somewhere.

So, I created a project with a simple orchestration.  After deploying it to
my local area, initially configured the receive port to use a FILE adapter,
and the send port to use FTP, worked great.

Used the web services publishing wizard to expose my orchestration, then
configured the receive location to use SOAP.  I see the things BizTalk
generates in C:\Inetpub\wwwroot\<application name>, and when I hit
localhost/<application name> in a browser, the index page shows the .asmx
file as an available web service.

The thing I don't understand is if I hit the link to the .asmx (or try to
add a web reference in a project, which I understand to be the way I'll test
this), I get a 404 page.  I mean either trying to browse to .asmx in IE or
the "Add Web Reference" wizard.

We turned on directory browsing in IIS, and it shows the name of the .asmx
file just fine, but clicking that results in 404 as well.

Questions
1) Anyone have an idea what I'm doing wrong, not being able to "see" the web
service?

2) Does this sound about right for an approach?  What I think I need to do
to test is set up some test project which has a web reference to my web
service, which will create a proxy to the web service.  I'll read in my xml
document, figure out how the web service interface works, and shoot the
document over there in that manner.

Thanks a lot to anyone who has input.