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Rubber trees are only hardy to 30F. If it gets colder than that at all where you live, the tree cannot not be planted outside. You can keep it outside in a container in the summer though. If it is too large, you may want to consider pruning it: https://www.gardeningknowhow.com/houseplants/rubber-tree/prune-rubber-tree.htm

Rubber trees are hardy to 30F. If it does not get colder than this, they can be outside year round. If it does get colder than this, it can only be outside in the summer.

This article will go over the best way to make additional plants from rubber trees: https://www.gardeningknowhow.com/houseplants/rubber-tree/propagation-rubber-tree-plant.htm

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

It is not getting enough light. Move it to another location that receives more light. Yes, you can set the plant outdoors during summer. In fact, it may even appreciate the fresh air.

Do you fertilize it regularly? It may be that the salt from the fertilizer has built up and the plant is getting a bit sick from it. Try repotting it with some fresh soil. While you are doing that, just check for root rot too. This is the less common reason for spotting on this plant.

There could be several reasons for this and it's often difficult to pinpoint the precise cause. Brown, dead spots on leaves are usually scorching, a sign that your plant is getting too much light. If this is not the case, look towards watering. Brown spots can also be due to a lack of watering. Fungus can be a cause as well, but this is more prevalent in overly moist plants.

Here is an article on caring for rubber tree plants that you may find helpful: https://www.gardeningknowhow.com/houseplants/rubber-tree/how-to-care-for-a-rubber-tree-plant.htm