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Stick with two similar varieties of male and female plants (as you have done). When planting holly shrubs, place them in full sun or partial shade and well-drained soil. The best time for planting holly shrubs is fall, although spring is also suitable depending on your particular region. Warmer climates benefit from fall planting so their roots have plenty of time to take hold before the onset of hot, dry summers. Hollies should be spaced 2-3 feet apart, depending on the variety used and overall size. Most types of holly shrubs have shallow root systems so add mulch. Holly shrubs can also benefit from occasional pruning to enhance their appearance.

It may have a bit of sooty mold. This article will help:
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm

The plant has sooty mold. This article will help you:
https://www.gardeningknowhow.com/plant-problems/disease/how-to-get-rid-of-sooty-mold.htm

You will want to give them a year to establish themselves before pruning. Here is an article on pruning holly: https://www.gardeningknowhow.com/ornamental/shrubs/holly/trimming-holly-bushes-how-to-prune-holly-bushes.htm

Yes, you can. This article will help: https://www.gardeningknowhow.com/ornamental/shrubs/holly/holly-cuttings.htm

I would increase watering. New shrubs need significant amounts of water for the first year to establish well. I would not worry about pruning it at this time as this could further stress the plant.