We weeded the ground underneath, and put one of our wire compost bins on top of the soil. On that, we put a chimney of compost and soil, with a surround of hay. We then put about 3 levels of 3-4 potatoes, finishing off with around 8 in the top layer.
We watered it well, and will start to put kitchen scraps in and will tip the grey water into the middle to keep it watered.
Will update later in the season.