Every (new) player starts with a basic apartment along with some basic furniture. The first time you touch the system, the server will give you a quick tutorial on how to use the functions you activate for the first time. Your first apartment is given to you for free, however you do have to pay the rent at your paychecks.
In your apartment you can acces your owned furniture by inserting the command; '/furnitures' here you can view your furniture and also manage furniture that has already been placed. From this menu you can also move, remove and texture your furniture and walls.