Well it is time you read the manual

NTS or Samba is the way to go. It is too much to cover in a short note, but you have to be superuser (root) to export and mount filesystems.
Generally as root you simply add to /etc/exports file those filesystems to be exported, and as root on the other machines you simply mount the exported file systems to a local mount point (i.e.: directory name) aka:
"mount -t nfs debian2://filesystem-path/filesystem /localfile-system"
You have to have rpc running on each machine.
Use "rpcinfo -p hostname" to see that rpc services are actually running, and you may try "telnet hosthame port" to check that the services are getting thru the remote firewall(s).
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Grahame
AMD Phenom(QuadCore), 8GB ram, 3ware RAID6, HD3850(512MB) ...etc.