Connect 10.6 Server to Win 2008 Server for Authentication

Hello All, I want to create a testing enviornment before I deploy it on my network. This is what I want to accomplish: I want to have my users use my AD credentials but want to have WorkGroup Manager manage their prefrences (i.e. Dock settings, permissions, home directories, etc). The OSX Server will be 10.6, the Mac clients will be 10.5 and they will be authenticating to a Win 2008 AD. Questions: Anyone have good documention on how to set this up using OSX Server 10.6 with a Win 2008 AD enviornment? Also, I currently have over 4000 users in my AD. Only about 300 users will login to a Mac and authenticate to my AD. How would I add those 300 users to a local group(s) in WGM to push out policies to them? Thanks in advance for your help!