How to start a fish-pond?

I have enjoyed caring for fish in a tank and have a lovely little pond in my backyard that I would love to begin filling with fish. Sadly, I'm not quite sure where to start



For reference, my pond resembles that one. It is a little bigger with a taller two-level waterfall.

Koi are definitely an option, but I was wondering what are some other fish that could do well in a pond? I would like to have some diversity and not have all one type of fish, if possible.


Also, are there merits in making in making a pond have "bi-levels" or a little half tunnel like the gorgeous pond pictured here? Also, are there any must-have plants? This is a bit of a far-off project and I wouldn't start until spring. Just wanted some opinions.

Thanks so much!

Hello tess, I am not able to see your images. Could you please provide the correct links?

Where do you live? Nope, I am not asking for your address. Just need to know which state to get a good idea on the weather conditions there.
How big is your pond? It is the best to know how many gallons of water it can hold. So we can get a good idea on how many fish and what kind of fish you are able to put in there.

A fish pond should be set up similar to an aquarium. It will need a filter system running 24/7 to get rid of the ammonia. Unless you have a huge pond with tons of plants but only a handful fish.

Koi is probably the number one choice for an outdoor pond. The choices for outdoor pond fish species are actually very limited. I am not sure why, maybe it is because they can easily turn into invasive species unlike the tropical fish species.