IPTABLES shell script

Need IPTABLE configured on Ubuntu 11.04 server 1) Configure iptables to block everything except for defined ports & IP addresses 2) Adapt shell script with rules after they have been configured as a backup in the event of hardware faliure. 3) Append Rules to file to avoid loss of iptables rules on server reboot 4) Stop server from being nmaped for open ports. 5) Auto start rules on server reboot Once the above is accomplished you must provide a word document to how to append & delete rules blocking IP's & ports + how to drop in iptables file to save.