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These plants only need to be dug up in colder regions. In your area, the bulbs do not need to be dug up and stored for winter; however, in zones 6 to 7, they thrive better if the bulbs are protected by a thick mulch throughout the winter. After moving them where you want, simply leave them be and they will continue to reproduce each year, dividing them once they become overcrowded.

Once they are finished flowering, cut back the flower stem as far as you can, to the ground even, but allow the leaves to remain and die back naturally. If you live in a cooler region, say zone 6 or below, you need to dig them up in fall and store them for replanting next season. For warmer areas of zone 7 (with mulch) or above, you can simply leave them where they are and they will continue to reproduce each year and you can divide them once they become overcrowded.

Are you sure they are glads? It is unusual for them to survive winters in your zone. Also, these plants are not generally prone to being so aggressive as far as their growing and cormas can normally be easily removed. You may need to dig up the bed in its entirety to fully remove this plant or spot treat any pop-ups with Roundup.

Once they are finished flowering, cut back the flower stem as far as you can, to the ground even, but allow the leaves to remain and die back naturally.

Cut flower stems in morning or evening (following regular watering) at an angle and submerge into water right away. For more information, this artivle will help: https://www.gardeningknowhow.com/ornamental/flowers/fgen/how-to-keep-flowers-fresh-after-cutting.htm

They likely will not make it through the winter. I think your best shot would be to plant them in containers indoors and let them sprout indoors. If they can get even a few weeks of foliage growth to replenish their energy stores, they will have a chance to make it to the following spring.

But, I would not expect very big blossoms from them next spring. They will be working on a minimal amount of stored energy, which will result in a sub-par bloom.