As others have said, good luck with your search. Winter is a good time to buy one, but not necessarily a good time to drive one. If it's cold and wet, be careful.
As for the age/mileage question, although I like low mileage cars I tend to agree with this:
Personally, I've never been too fussed about milage. A car that's been sitting not being driven can have as many problems as a mediocre milage car.
Service history and driver history is my main concern. An so long as it's a reputable service centre I'm not conserned about Nissan stamps.
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Once you get past a couple of years old, I'd buy on condition and good history rather than just mileage. A few years of neglect and lack of use is usually far worse than plenty of use and good servicing, assuming it's had both. If you can get a low-ish mileage Zed with plenty of history, that would be your best option - particularly as someone new to that kind of car - but you might have to pay for it. Although in the long-term hopefully it might save you a few expenses.