There are many tutorials, however its fairly easy. First make sure you have samba installed and running using the service command as root IE:
#service smb status
This should output either the status (running or not) of the service, or it will say no such service...in which case you need to install samba.
After that just find your smb.conf file, which is usually /etc/smb.conf and edit it to allow users to browse the shares or whatever it is you want to do...just type smb.conf in google to find some good information..