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They are hardy in your area, and in fact, down to zone 3! They will go into a dormant state over the winter, and not much will need to be done. Just make sure that they don't remain wet, constantly.

https://www.gardeningknowhow.com/ornamental/cacti-succulents/hens-chicks/growing-hens-and-chicks.htm

That, particular, species would be fine to put around the base of your trees. It wouldn't harm anything.

https://www.gardeningknowhow.com/edible/fruits/apples

https://www.gardeningknowhow.com/ornamental/cacti-succulents/hens-chicks

Yes, you can use a plant light on your Hen and Chicks 'Black' (Sempervivum species). These plants are hardy succulents that thrive in bright, indirect sunlight, so you would want to replicate similar conditions with a plant light. A full-spectrum LED grow light that mimics natural sunlight is ideal for succulents. The light should be bright, around 2,000 to 3,000 lumens, and you should keep it on for about 12-16 hours a day. Make sure the light is positioned about 6-12 inches above the plant, adjusting based on how the plant responds to avoid burning or inadequate lighting.

This article will go over the general care needs of the plant, which you will want to replicate:

https://www.gardeningknowhow.com/ornamental/cacti-succulents/hens-chicks/growing-hens-and-chicks.htm

Unless that is all that you have, I would use purified or spring water. Either will avoid harsh salts added, as well. They like it better dry than wet. Just water them until water runs out of the container, and remove all of the extra water that gathers. Wait until their soil is almost completely dry, or even let it dry out all of the way before watering. As long as water can drain out of the container, fully, and it dries between watering, you are good. In fact, they would prefer neglect to some degree.

I cannot recommend any videos, other than recommending to search on sites such as Youtube. You will need to wait until it flowers and goes to seed. I see no signs of flowering. There is no way to save the mother once that happens. You'll just have to replant one of its offshoots. It is very difficult to grow these from seed, especially if you are just starting out with these plants. These are extremely hard to kill, so just follow general care guidelines for them. Less care is better.

This search will show more of our articles to help you with these plants.

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Yes. Please refer to the first article on their care, as it goes over what to do and the ratios.