Questions for adding code

Hi list!

As i only know ipcop, i hope you can help me here. I am thinking of developing some extracode for being able to configure vpn-Firewall rules via WUI.

I don't know how to start.

I just want to create a cgi, that is similar to the outgoing firewall with the exception that this configures the CUSTOMFORWARD Chain.

The gui should create a txt file with the rules....

I need to know:

1) Where should i beginn to make ipfire read the rules on boot?! 2) How do i implement the code in the checked-out git repository local? 3) did i forget something?

Greetings alex