Ewest is absolutely right as usual. Don't let yourself get overwhelmed by all the info and suggestions.
I mentioned the HSB above for several reasons (as stated), but if they aren't a fish of choice for you then there ARE other options. Ewest mentioned DO levels and water temps, but HSB also require water hardness levels of 51 ppm or better. Some ponds have it, and some ponds don't. The higher hardness the better for ALL fish (better growth).
Do this: Get a pencil and a piece of paper and write down exactly what you want. What kind of fish do you like to catch? How much money do you want to invest up front? How much time/money do you want to put into the pond in regards to "up keep"? Do you want to drain/restock every 5 years or so, or just let mother nature have a go at it? Make a list of your perceived pros and cons, and then focus on the longer of the two lists. At that point you can fill us in on where you stand, and we will try to guide you correctly.
