[Samba] Setting Separate File server from Samba PDC

[Roberto Mason]

I'm aim to set up a file server that is separate from my SAMBA PDC. I've
had no problem setting file server up, and joining it to he domain using
smbpasswd. 

Can I use winbind with a SAMBA PDC or is it meant only for Windows NT
servers.

When creating shares on this file server, I need to allow permissions to
various groups and or users. How can I do this. Do I need to set up NIS?

Thank You in advance
Roberto