First make sure it's installed properly, should be if it came with RH8, now you need to to configure it by editing the ex. /etc/samba/smb.conf, you probobly should use a frontend to do this if your "new". I suggest gnosamba this site should have some rpms for you http://ftp.falsehope.com/pub/gnosamba/
Make sure the security option is set to "share" or you wont be able to access the shares from win32.
Next you haveto check if it works and mount the shares to access them, here i suggest LinNeighborhood http://www.bnro.de/~schmidjo/
a nice share browsing prog, but im sure RH8 has something for this.
and you shuld be all set...