Joining a clan -- 15k armor

a few quick questions if somebody can please answer detailed that has been there.

1: Im in Zos Shivros to be able to enter Cavalon im told by the guard I have to join 1 of the three clans. Can somebody please specify how do I join one of the clans.

2: In Arborstone how do I get into the house, doors are closed.

3: What quest takes you to Breaker Hollow

4: Weres the 15k armor at how to obtain it.

Thanks

You need to beat Arborstone and continue to do the quests until you have both the Urn and the Spear. Then beat Shiro for the first time... after that they will let you pick a faction to play for.

Take Luxon if you want to get to Breaker's Hollow.