Are you on the same floor as the electrical panel? If yes, it is unlikely that there would be wires UNLESS they are powering something in that section of wall.

Does the section of wall you’re working with have any lights, light switches or electrical outlets?

If no, you’re probably safe. Why would there be a wire there?

If you’re NOT on the same floor as the box, and there’s another floor further removed from the box relative to where you are, then there could conceivably be a wire powering something on that different floor. Example: box on floor 1, you on floor 2, device getting power on floor 3.

I should add that you might want a junction box in the middle of this whole thing (in the attic) in case you decide to add another outlet/whatever to this circuit later.

No.

You cut the hole where the outlet will be.

You feed romex wire down from the attic to that hole (ideally with metal sheath).

The part at the circuit box is important to do and do properly, but doesn’t pertain to your question, so I won’t get into that.

Then you insert a box in the drywall hole and feed the wire into the box. Secure the box to the stud/backside of the drywall. Attach the wires to the receptacle and secure it in the box. Install a cover plate (adjusting the 4 metal tabs at the receptacle corners with pliers may be necessary for it to sit flush).

And that’s it. Except for the circuit box part. But don’t attempt that as a layperson.

Go to HomeGoods. Get a cart. Walk through the whole store. Pick 1 item per aisle and put it in your cart. Buy the items and put them in your kitchen.

Basically, I’m seeing a lot of blank white. Not very charming.