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It's an unusual situation. We have a series of articles about caring for rubber plants and I'm hoping you may be able to glean an answer from one of these. Otherwise, you may want to consult with your local nursery or extension service for more help.

https://www.gardeningknowhow.com/search?q=rubber%20tree

Here's an article that will tell you how to prune your rubber tree:

https://www.gardeningknowhow.com/houseplants/rubber-tree/prune-rubber-tree.htm

Either way. By now, the cut has healed itself over, and cutting again will only increase the chance for infection. I would leave it, personally. You can cut it off once it starts to die back.

Here is an article to help you care for the plant:

https://www.gardeningknowhow.com/houseplants/rubber-tree/how-to-care-for-a-rubber-tree-plant.htm

You, probably, pulled off its protective sheath. These plants are best left alone, and forgotten about, save for watering when it gets COMPLETELY DRY half way down the pot.

The leaf will continue on its own. Just leave the tree to grow and care for it when necessary.

This article will help:

https://www.gardeningknowhow.com/houseplants/rubber-tree/how-to-care-for-a-rubber-tree-plant.htm

Just plant them into soil. They won't do well in water. Make sure to let them dry out pretty thoroughly between waterings, as they are very drought tolerant. Plant them all separately. They will take a long time to recover any root damage, so expect it to be a month or so before you notice any signs of recovery. This is just going to be a long battle of patience. They don't tolerate being moved very well and like to be rootbound, so any disturbance to the roots will set them back quite a bit.

This article will help you to care for them: https://www.gardeningknowhow.com/houseplants/rubber-tree/how-to-care-for-a-rubber-tree-plant.htm

They will probably remain bare until it is old enough to start branching. On occasion, stripping leaves can encourage branching, but this is not always the case. The best thing to do from here will be to keep anyone from stripping anymore leaves, and continue to care for it as usual until it recovers. Once you see signs of vigorous growth, you can cut the plant back. It will sprout new branches at this point.

This article will help you to care for these shrubs: https://www.gardeningknowhow.com/houseplants/rubber-tree/how-to-care-for-a-rubber-tree-plant.htm