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If your trees have grown that tall, your thumb isn't black, except in the good way because it's dirty.
Controlling them is simplicity itself. Get a pair of plant pruners, and cut the stems at about the spot you'd like to see them start to branch out. When each new branches have 3 or 4 leaves, you can cut off the ends of those to encourage more branching. You can stick the cut pieces back into the soil beside the main stem; there's a good chance they will root. Or stick them into their own pots. Here's an article with more info: https://www.gardeningknowhow.com/houseplants/rubber-tree/prune-rubber-tree.htm

Yes. Your plant has an infestation of scale insects, which secrete a sticky substance called honeydew. Eliminate the bugs, as in the following article, and you can use soap and water to wash the residue off furniture and floors. Here is your information: https://www.gardeningknowhow.com/plant-problems/pests/scale-bug-how-to-control-plant-scale.htm

It sounds like it is having issues with its roots, likely from the overwatering which may have led to root rot. Only water when the top of the soil is dry. This article will help you check for root rot: https://www.gardeningknowhow.com/plant-problems/disease/treating-root-rot-gardening-tips-for-housplants.htm

After the issue it corrected, the leaves may regrow on the lower half. This article will help with other suggestions: https://www.gardeningknowhow.com/houseplants/rubber-tree/rubber-tree-plant-leaves-falling-off.htm

I can give you some information on rubber trees, aka Ficus decora, used as houseplants: https://www.gardeningknowhow.com/houseplants/rubber-tree/how-to-care-for-a-rubber-tree-plant.htm
and information on growing a rubber tree outdoors as a landscape specimen: https://www.gardeningknowhow.com/houseplants/rubber-tree/rubber-plant-outdoors.htm
They grow in almost any kind of soil, needs to drain well, no boggy or desert conditions.
If you're growing in a pot, don't use outdoor soil, use a soil medium formulated for potted plants.
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/using-topsoil-and-potting-soil.htm

A rubber tree is a tropical plant. The general rule for tropicals is no temp lower than 40F, although rubber tree will tolerate a few hours of low 30's. You should definitely bring it in before frost. You should probably begin now to acclimate it to indoor life: https://www.gardeningknowhow.com/houseplants/hpgen/acclimate-plants-indoors-winter.htm