members login

Hello Folks,

I am designing a site and I have been asked to create a members area.  The
customer would login with Username and Password then would be prsented with
pdf files, that are specific to their company, available for download.

I haven't done anything like this before, i just have a little experience
with HTML, Flash, css and a little bit of programming so if you could put
everything in laymans terms it would be much appreciated.

Many thanks

Darren