Can't access FTP Using Static IP

Hi

I've just got a static IP address from my ISP but I can't figure out how to use it. I have a home network going through a Cable & Wireless router. My internal ip is 10.0.0.4, my static ip is 85.92.186.66

I'm trying to run a FTP server which isn't going well. I can gain access to the ftp server using 10.0.0.4 on port 21, but that doesn't help people outside my network.. I have tried to port forward using the following :-

port 21, TCP & UDP IP - 85.92.186.66 it jst keeps failing to connect to ftp, I cant even bring up the remote server info using my ip in the address bar of firefox

If I set my TCP connection settings to : -

IP - 85.92.186.66
Sub - 255.0.0.0
Gateway 10.0.0.2

Ftp works, but I don't get no internet

Anyone got any ideas?