There are essential equipment that are needed to safely keep fish. The aquarium itself, aquarium stand, aquarium Filters, Heaters, Thermometers, dechlorinator, and Fish food are the essentials. If you want to make your tank look more natural try getting substrate such as aquarium sand/gravel. Aquatic plants, rocks, and driftwood can all be added to the aquarium to spice it up. The instructions to setup everything can be found here.