How to Automatically Fill in User Logon Name Field in AD

I would like to automatically populate the “User Logon Name” and email address each time I create a new user.

It would be based on the users first, middle (if exist)and last name.

So if I create a new user named Joe L. Shmoe the end result would be a new user with the logon name:

user logon name: jlshmoe
email address: jshmoe@domain.com
users home directory: \\fileserver\home\jlshmoe

I know this can be done as I have seen it in production on NT, however I can not remember the steps and do not know how to configure the properties of UserPrincipalName in the Schema on Server 2003.

Thanks in advance for any help!