I'd advise taking a look at
http://ff.pyromaniacs.co.uk and clicking tables and look at participating clans and then pick out some you like the look off then visiting thier irc rooms.
PS. Played my first clan match last night in FF(as a trialee), and I think soldiers have no where near the stopping power they had in TFC, and that isnt a bad thing. Both teams was well skilled and I think there should have been more experimental use of snipers/pyros.
Which brings me to a question I'll make a new thread on :P