What's your question? Ask

As it is growing, there are no nutrients, and further, no roots to take up nutrients. It will slowly die, unless you replant those offshoots and force them to root. This is slightly different than rooting many other plants.

This article will guide you on how to do this: https://www.gardeningknowhow.com/ornamental/foliage/yucca/propagation-of-yucca-plant.htm

Almost all parts of the plant are edible. Some need to be boiled to be safe for consumption. but this plant has been used for a food source for some time.

This article will give you more information: https://www.gardeningknowhow.com/ornamental/foliage/yucca/yucca-plant-as-food.htm

In your area, yes. As long as they are the standard variety that you see normally around your area. If this is a soft leaf variety, then you may want to consider bringing this in during the coldest nights of the winter.

This collection of articles will help: https://www.gardeningknowhow.com/ornamental/foliage/yucca

It's possible.
This article has information on the most successful way to propagate.
https://www.gardeningknowhow.com/ornamental/foliage/yucca/propagation-of-yucca-plant.htm

Yes, as long as the pot is big enough to accomodate two plants and their root systems.

I don't know which species of yucca you have, but you should consider the form of the mature plants and how they will look together in a couple of years, crowded or not.