It comes in a great box that includes everything you need.
You need to (if you are that way inclined) mount the board and breadboard onto the plastic base provided. If you read the instructions you’ll see there are only supposed to be three nylon bolts to hold your Arduino in place.
It comes with lots of exciting bits and bobs including cables. I’ve tucked my power cables under the Arduino to keep them out the way.
Since writing this I’ve been working on an Arduino section.