Edge it however you like (I used rocks I dug out of the hole and split with a 20lb. maul), and transfer your cured water and plants. As with any pond, I start with a few mature plants and existing pond water where possible, and add clean (not chlorinated) water day by day until the pond is full. Aeration is critical in a pond this small, so a small fountain or bubbler can really help. Water lilies don't like troubled water much, though, so I ofter run an air line and an underwater power head to move things around, when I'm not pumping the water in and out as part of another loop.
(Small) fish keep the plants happy and take care of mosquitoes. I like to drop a few large comet feeder goldfish in. You can see I used mature tropical waterlilies to break in the pond, but eventually I swapped them for new hardy waterlilies that have been happy there for the last three years. The fish, too, overwinter each year. I don't feed them, but I do feed the waterlilies each year.
