You should be honest & tell your client that you have no experience. Either
hire some outside help or point them to another company. This isn't a load a
CD & install type of program. You really need to know what you are doing.
Else I forsee disaster for both.
Other than that, here's a link to some important docs avialable for download.
http://www.microsoft.com/downloads/details.aspx?FamilyID=eec997be-50c8-4d27-8bf2-fa93c9ac282a&DisplayLang=en
you can find installation docs & hardening guide regarding the server.
If you are interested we can help you for this implemenation. Please drop an
email offline to discuss.