I know this site that can sign up for you and everything, it's kinda costy though but here's the link everyone. After I get my first couple paychecks I'm thinking of joining TeamAyu and the Tackey & Tsubasa fanclub. T&T club first though because members get priority concert tickets and I'm planning on going next year ^_^.
Link:
http://www.eonet.ne.jp/~jfca/