Were to buy furniture to put in apartment

[1x1boop2]

I bought an apartment and want to fill it with furniture.
But all the stores sell food or tools.
I found one called "useful building supplies" but they clearly were not branded correctly because they sold guns.
I bought a gun and some ammo, but my character doesn't know how to load or hold it.
I am worried because the box said .21 but the gun need 8mm. They advritized it as generic "pistol ammunition".
I just want some shelved I already figured out I dont need to poop.

[orb]

You buy the furniture from inside your apartment and not in a store:

https://steamcommunity.com/app/986130/discussions/0/3828665107794242160/

https://steamcommunity.com/app/986130/discussions/0/3829792183364974146/