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Don't you want them to bloom outside? Mums will tolerate a frost. Your hardiness zone is 5, and mums are generally hardy to zones 4 or 5. I would bring them in tho if temperatures hit 32 F or below. If you want them to bloom inside, put them near a sunny window and keep them watered. After they bloom, remove the flowers, but leave 2 to 3 inches of the stems to protect the crown. To overwinter inside, you can store them in a cool, frost-free location till spring. Water about once a month, enough to keep them alive. Too much water will cause them to rot.

It may be a little late to plant them in the garden now, but in the spring, you can plant them in a well-draining area with full sun.

https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/wintering-mums.htm

https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/annual-vs-perennial-mums.htm

https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/growing-chrysanthemum-flowers.htm

Yes, it should stay white. My white mum has returned for 20 years. There is such a thing as a "sport," which is a mutation that could result in a color change, but that is not the norm. A cutting from the plant should look identical to the parent plant.

https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/annual-vs-perennial-mums.htm

You can if there is more than one main stem under those branches. If not, you can cut off some stems and root those.

https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/annual-vs-perennial-mums.htm

https://hortnews.extension.iastate.edu/faq/how-can-i-propagate-garden-mums

Always cut off blooms on cuttings to propagate. You want the plant to concentrate on forming roots, not flowers.

Water them regularly till they are established. Then, during the winter if you have dry spells, be sure to water them. Many people forget to water them during the winter, so the mums succumb. Also, after a few hard frosts, mulch them well with straw, leaves, or a bark mulch to insulate the roots.

Sometimes, though, despite your best efforts, mums don't return.

Here is more:

https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/wintering-mums.htm

You could leave it outside and it should be fine. The weather maps show your area only gets about 30 degrees F in the winter.

Indoors you can put it in a cool location that is frost free. Water it when the soil dries out but do not keep it overly wet or it will rot. Then you can move it back out after the danger of frost has passed. Try to give it more sun, full sun if you can. Here is more:

https://www.gardeningknowhow.com/ornamental/flowers/chrysanthemum/growing-chrysanthemum-flowers.htm