The most important hing is that this can't be the place where all the elves are shoved, City elves can't be tossed out of their homes because 'eh, they've got someplace to go now'
I think it would mostly be Dalish who go there, their wouldn't be much change in lifestyle I feel, so while City elves still ought to be accepted if they want to join, it shouldn't be forced.
Alright, that said, here's how I feel it should be organized.
Any thing that is within-clan is that clan's concern. If they want to accept new people, theft from another clan-member, lying, cheating, whatever, so long as it is between clan-members it's their concern. If it's between clans than it's adressed at they're meet-up they already do, where, presumably the keepers of the clans, decide what to do. They also select and hear from Ambassadors to and from the human and dwarven kingdoms.