in red hat 7.1 samba configuration file is in the path

/etc/samba/smb.conf ..that is for sure as i work on it...infact when you install the rpm you will get that file plus the smbd and nmbd daemons..and you will have a script called smb under

/etc/rc.d/init.d

and for final check of your service, assuming that you know to set up the configuration file i suggest the following checks ups

1, you have created the samba users
2, you have set the security level ( security = ) to the proper value in the config file
3, both smbd and nmbd are running
4, no ipchains/iptables rules are blocking your samba server
5, you network is working fine
6, you have set the workgroup/domains properly

i understand that your first problem is that you dont have the config file..for that you have two options

1, create the config file by hand and confirm that you have the above mentioned daemons
2, simply reinstall the package once again and all willl be fine

i hope i have been of help to you...feel free to get in touch..happy hacking

with regards
scorpion