All garden pools regardless of their size are constructed pretty much the same way. You can use a rigid, pre-formed black pond liner or black pond liner however if you want to save a bit of money you can use a pre-formed kiddy pool. Ideally the pond should be at least 3 feet deep at its deepest but if over wintering fish the pond should be deeper. The pond excavation site should be leveled which is very important when using pre-formed liners. Pond constructed with pond liner should be leveled then lined with old rug material or sand to cushion the bottom somewhat. Once the liner is in place water is added, smoothing out the liner as the pond fills. Filtration and water movement is added then the edge is naturalized with rocks and vegetation along with the pond planted. Floater plants are added and finally the fish. Our experience was it was better to add fish a good week or so after the water had time to age. Here's a video outlining how to set up a garden pond. Enjoy!