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Many people have been successful with growing this hardy vine in northern climates. Wisteria typically does not need any special treatment for winter. It is able to withstand temps of up to -30 F to -40 F. Here is additional information that may help if you decide to grow the vine in your area: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-winter-car.htm

You can remove them or leave them. Either way will not hurt the plant nor affect its growth. You can coax its growth by adding a bit of balanced fertilizer, though these plants usually don't require much in this department.

There are several things that could cause this. The most likely culprits are either too little water, a fungus or a pest. I would recommend increasing water and treating the plant with neem oil, which is both a fungicide and a pesticide (and organic).

There is a chance that it is a disease like curly top virus. This is unlikely, but possible.

This article will help with that: https://www.gardeningknowhow.com/ornamental/vines/wisteria/pruning-wisteria.htm

I would guess that the nitrogen to phosphorus ratio is off. The soil may have an abundance of nitrogen, which would result in nice, healthy green growth but little to no blooms. Without the right amount of phosphorus, it will not bloom well. Bone meal is a great way to add phosphorus. This article will also help: https://www.gardeningknowhow.com/ornamental/vines/wisteria/wisteria-blooming-problems.htm

If it's newly planted, it may simply be suffering from a little shock. They normally recover on their own and the leaves will regrow. Make sure it is receiving plenty of water while it establishes its roots.