Swirls will not appear on their own, but you will have to be careful what you wash and dry a black car with.
Nothing looks better than black....when it's clean.... for 45 seconds.
Get a California car duster, and spend 1 minute on the car before you drive it. That's all I do most of the time. Zaino "Z6" mist detailer when it gets dirty, and a wash a few times a year when it gets *real* dirty - like getting caught in the rain, etc.