Just bought Ornament Armament. I traded the metal with the bot that was required. Where/how do I receive the item I bought? I'm new and confused about everything.

In your inventory there should be an exchange button, check the ornament armament and click exchange. The bot will trade with you and will present to you the item, which you can then trade to your own inventory.

If you bought ornament armament that thing should be in your own steam inventory.