Welcome back, blackwater!

Like all the other nobles, monarchs purchased their titles from the store some years ago, and so they have had the opportunity to discuss their plans with the studio.

With respect to land ownership, you can purchase land with Exposition Points that you can buy from the store (your KS package may come with some). EP can be used during the staging phase the studio calls Exposition, which will happen a few months before launch.

You can also buy land by purchasing it in game. You would do that by going to the county seat of the county that you're in and interacting with a Land Management table in the town hall.

With respect to playing with your wife, yes it's absolutely doable. Everybody enters the world by taking over an NPC, so once you enter the world you can give your wife a family code with which she can enter the world in the same family. That's the gist of it, anyway.

p.s. To play different tribes you would have to find NPCs of the tribe each of you is interested in and then meet up somewhere in the game. I don't believe there will be any mixed tribe families by default.