Domain

On Active Directory, open user properties > click on Account tab > click on Logon to
You really need to read more about Active Directory, Windows Server Roles (if you are interested in file server), User Management, there are plenty of resources out there.
Cheers.

I would open "Group Policy Management" and create a new group policy. Call it "Redirect My Documents".

Apply this policy at the root or better yet the folder where the machines are located.

Go to User Configuration -> Folder Redirection -> Documents

Target folder location Select
"Create a folder for each user under the path root"

Root Path
\\servername\sharename\users

This will automatically create the folder on the server when you create the user and logs into a domain computer.

ON the server here is the default permissions you should have.

Folder Redirection permissions

technet.microsoft.com/en-us/library/cc781907(WS.10).aspx