I did one on a farm a few years back. You pay by the fish with minimums.

A few things to do first. You need to check the ponds ecosystem for things like disolved oxygen. Which means you have to wait a year. You want to see what the water temps are at the deepest spot at the peak of summer. Then check the oxygen levels to see if you have to areate the pond or not. Or you could just install a pump and an areator and go for it. You are going to have to measure and estimate the volume of of water and then check the biology to see how many fish it can hold . Unless you plan to feed and medicate for artifically high populations. There are a buch of sites on the web for research. I am not sure if you need a permit in Pierce county.

The pond we did yields 10+ lb rainbows and they die off every five years. They taste like mud because the primary forage is brine shrimp.