An excellent guide; it will give you steps about using Samba server to join to a Windows domain. From the article:
The primary domain controller (PDC) will serve as the password server for the domain. If Samba and winbind services are running, turn them off. I will show you how turn them on after you join to the Windows domain. You should save your files at any point in your “work-in-progress” and restore your originals if you intend to reboot. You should make note of your hard devices listed in your fstab file. Before you start you should ping the server from your intended Linux workstation.