You cannot wear armour

As an Ethereal Hand, your hands float at 3-4 feet above the ground, you can choose what creature your hands take the form of, they assume the shape and size of that creature's hands. You have the size small.

You have a walking speed of 30ft

Hand folk are unageing.
Instead, they are tied to an anchor, a magical item, typically taking the form of a mundane object, such as a rock, a tree or a candle. 

You can speak telepathically, and can read, write and understand (not speak) common.

Your arcane body, has innate magic.
You have proficiency in Arcana.
You know the Cantrip Mage hand

You can move through creatures and objects as if they were difficult terrain. You cannot end your movement inside a creature or an object.

Ethereal hands have a particular affinity for Mage Hand; this affinity grants it a greater strength than a typical mage hand. With this additional strength you may use your Mage Hand to make unarmed strikes and count as a hand to two-handed weapons.

• Weapon Wielding:
  You may use Mage Hand to wield two-handed weapons as if you had a second physical hand. This spectral hand counts as your second hand for weapon handling.

• Ranged Unarmed Strikes:
  You can make unarmed strikes using your Mage Hand up to its spell range. These unarmed strikes deal damage according to the unarmed strike rules for your character.