Your average goldfish needs 20-30g PER fish. Keeping them in a 7g over the winter will probably stunt their growth. I'd suggest you wait till your pond is setup, running, and cycled and then stock it with the goldfish. Small fish grow really fast in a large pond. I've had 1" fry get up to 5" in a few months. Also fancy goldfish dont do as well as common goldfish or pond comets. And wintering a pond depends on your location, if it gets cold enough to freeze over then you will have to move them inside. In Southern California my goldfish fair fine in my 500g pond all year round.
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