Script - Tentation! ( for experts )

[Carstea Catalin]

I want to make a script but i don't know how. Please help me! 
 1.I want one script that put MAC address automaticaly to my ruleset of ipfw 
and restart at the end of script ipfw - service .
2.In this script ipfw has rules to permit only some MAC addresses and deny 
others.
 *Ex: /etc/firewall.sh -add "00:23:f3:23:a0:e4" -name "WS1"*
 In this script ( /etc/firewall.sh ) are my rules to permit only MAC address 
of my LAN users specified with this inputs (*-add 00:23:f3:23:a0:e4 -name 
WS1)*
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To make this script a must verify if exist "-add" and if exist i must verify 
if exist " 02:23...." (the MAC) and after if exist "-name" and "ws#"
................................................................................................................................................................................................
.....after i must add this MAC adress to ipfw command in the 
/etc/firewall.sh
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 If exist one expert that can helpe me please give me the script! Tks!
     
Carstea Catalin