Some missions in the mission center will include the chance of gaining a nobility title and maybe some land. But this missions are extremely dangerous and long but they will be rewarding you will become a noble in the Empire and will be able to own some land there's two ways of acquiring land. You might need to buy it AND claim it by defeating all the monsters in the map or be rewarded with it in a mission.
In the future there will be more things you can do with lands this is only phase 1.
Gaining Land
To gain land you must either buy it with Stature or earn it in a Empire Mission.
You may also challenge a Lord to combat after getting an Officers permission you may challenge a Noble for his title an land.
If the Lord loses he is no longer considered nobility until he gains a new title.
The victor is considered a noble and new Lord of the land and all land assets are given to him.
Titles
Lord
Duke
Archlord
Archduke
Count
Prince
King
Upgrades
You can buy defenses and can c pay other guild members of lower rank to defend your land.
Wars
Nobles with permission from the officer can engage in warfare in which the winner will recieve the land and title of the loser and he may give it to anyone he wishes as logn as they are from the guild.