Just a couple of ideas.
Put the link in our Bio's.
Send msg to all SCA members/Friends of SCA on xbox live informing them of the site.
Edit:
This is what I got on my Bio at the moment.
"Looking for a NZ/Aus Call of Duty clan?
Southern Cross Assassins
Requirements:
* Must be from New Zealand or Australia
* 15+ and mature
* Must have a working headset
* Respect other members of SCA
There is no set K/D ratio required to join.
Visit our forums to send a application.
https://scaonline.forumotion.com ".