onnection between Windows 2003 service and Lunix

need to know step by step how to:
integration between a Windows 2003 server nad a Linux Server.Use the Linux Server from the Windows 2003 server.using Active Directory and samba. Connect Windows 2003 Server to Lunix.
Configure a user account in Linux and allow access from Windows to use Linux.

Ensure that both Windows 2003 server and the Linux server are fully functional and I have administrator access to bother servers.
can anyone help please