Make the pond bigger and deeper if possible. Bigger ponds are less maintenance. Provide some in-water plants and rock features so the fish have a place to hide from predators. You will also want to build in some shelves for water lilies and pond grasses.
Skip the fountain, the water plants will cover a good part of the surface. Get a skimmer and a good quality waterfall/filter.
Lots more info here:
http://www.lilypons.com/infomain/instruct.htm