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Oh boy, where to start. I’d say first, read up on the nitrogen cycle because that’s the most important part of filtration. Read up on KH (carbonate hardness too).

Then make sure you’re going to have more filtration than you need.

When designing the pond, keep predators in mind. I’m a fan of making the sides go straight down, and having the whole pond be deep. No places to walk into the water.

Plus, that kind of design means more water volume. More water volume means either more fish, or more stable water parameters and more room to grow. And along the same lines, build it to be as big as will fit! It’s a big cliche in the hobby that it’s never big enough, and here I am this year upgrading my ~3000 gal pond that’s 30” deep, to 6000+ gallons and about 5 feet deep.

If you install a bottom drain in the pond (recommended) gravity fed to a settling tank before it gets to the pump, you could vacuum all the fish poop out of that and get the majority of it very easily.

For the pond liner, you want 45 mil EPDM rubber. It is kind of expensive, but it is the standard for a reason.

And that’s not all the information obviously, but I think I’ve run out of steam, lol. I enjoy spreading the love with this hobby though, so please message me with future questions.

Edit to add: look up photos of bogs for ponds. They can be part of your filtration, but you can also plant a bunch of plants in it and the ones that can handle the wet roots will grow like crazy, eating nitrates and other nutrients directly from the water.