Wondering if someone can point me in the right direction.

Building a web page with a form on it that will access and search someone else's database for results. That someone else sent me certain information that would be necessary to access the xml feed, including the necessary login info etc. (I mean we have their permission and all that good stuff)

Since this other company has no documentation at all other than what they sent me, I need to know exactly how to build my form input fields to work with the xml info I've been given. I've never had to do this particular type of work with a form before and I'm completely new at working with xml as well.

What else would you all need to know to be get me started?
Thanking you all in advance!
bbw