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This link has pruning information.

https://www.gardeningknowhow.com/edible/nut-trees/chestnut-trees/pruning-chestnut-trees.htm

As a tree ages, it will become susceptible to more and more issues, just as a human would. With proper management, this tree can still live quite a while with the disease.

This article will help: https://www.gardeningknowhow.com/plant-problems/disease/weeping-amber-in-trees.htm

Absolutely! This tree will do just fine in your area. They are hardy from zones 3-8. Here is an article for more information:https://www.gardeningknowhow.com/ornamental/trees/horse-chestnut/how-to-grow-a-horse-chestnut-tree.htm

You may have had some help from squirrels or other critters planting them for you. You can remove them with a sharp spade shovel or hand trowel to prevent them from continued growth.

This looks to be a Horse Chestnut. Likely growing where a squirrel or chipmunk planted it!

https://www.gardeningknowhow.com/ornamental/trees/horse-chestnut/how-to-grow-a-horse-chestnut-tree.htm

The intense dry hot summer and fall will be a critical time for your horse chestnut tree to get a root system established. It needs regular watering through October and maybe until it starts raining or goes dormant in December.

It may have suffered some transplant shock or water deficit during the planting process. Hopefully that was not severe and the leaf loss is temporary and the tree will re-foliate.

Water deeply if you think that has not been done adequately. Not just a sprinkle, but a thorough flooding/saturation of the soil surface and as deep as the planted root ball. Mulch the soil surface with an organic material like compost or fir bark mulch from a garden center. Repeat the watering in a couple of days and then weekly through August. If it hasn't put out new growth by then, it may not recover.