What does a clan do for you? The help files indicate that joining a tribe is good, but it doesn't say why.
What tribe should I join?
Think of them like allies. Anybody attacks you, they're supposed to help. The big thing it does is that if you join a large enough one, it'll stop or at least delay people like me from sending 600+ troopers, rams, and catapults to attack your village. I'll steal all your resources, kill all your soldiers, knock your wall down, use my catapults to destroy your barracks/stable/Farm/Village HQ.
Once I've done that, you can't produce any troops, if you're large enough you'll have to build a farm before you can rebuild your barracks to even start rebuilding your troops. BTW: I'd still be raiding you during this.
I'm still a member of FAN, but as noted here, there's been a schizm. We're still pretty large, over 100k points. If you want to be a member, send me an in-game email(I'm Firethorn there too).