Hi Alyssa. To sell furniture all you need to do is drag the furniture you want to sell to the area outside the front gate. Green colored text will come up above the item and will tell you the price you will get for it. Ex. Sell for 22.

If you're happy with that price then drop the item and it will be gone and the coins will be added to the family bank.

If you decide not to sell it then don't drop it. Put the item back into the house or in your decor tray.

Don't ever expect to get the full price of the item.

Once sold you cannot retrieve the item but you can repurchase it from the store.

I hope this helps.