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You can either bring it into the garage or bury it in leaves. If you bring it into the garage, just make sure to water it about once a month. It will be dormant, so it will not need much water, but it will need some.

Yes. You want to water them at least once a month to prevent them from drying out completely.

Some varieties of maple do have "peeling" barks and are grown for this feature. It is a feature that often takes years to develop, so it is possible this is the case with yours. As long as it looks healthy and you do not see any signs of fungus or mold (it will look like a powdery substance), you should not have to worry about the tree.

Have you tried using a soil acidifier ? Miracle- Gro should help.

It sounds like eitehr a watering issue or a fungus. Increase water to the tree and treat the tree with a fungicide. You may also want to check the roots to see if they are healthy. If the roots have been damaged, this could affect the tree's ability to take up water, which would make it look as though it were under watered.

Maples are usually best pruned in late summer/early fall, though may be done in early spring when necessary.

It is possible that the orchid was overwatered. They really should be allowed to dry out some between waterings. Here is more information on the signs to look for with overwatering: https://www.gardeningknowhow.com/plant-problems/environmental/signs-of-plants-affected-by-too-much-water.htm

This article will help with caring for these plants: https://www.gardeningknowhow.com/ornamental/flowers/orchids/indoor-orchid-care.htm