Hi Susan,
Your new acquisition has been properly identified here and so has its need for better light. It should be within a couple of feet of a large completely uncovered window. The artificial lights can't be relied on for adequate light.
You can keep it in its existing pot, but I suggest re-positioning it slightly so the main stems are upright rather than leaning. That should keep it from falling over. If you keep it in its existing pot, you don't have to be concerned about over watering it unless it has no drain hole in the bottom. Fertilize it monthly if you keep it in that pot because the soil is old and may be somewhat depleted of nutrients.
You can repot, but only onto a pot that is no more than two inches wider and deeper. Don't replace the existing soil and add new potting mix only to the bottom and sides of the root system - not on top.
You don't need to mist it as that has almost no benefit. However, you should consider pruning it because it appears to be quite large for its new space and may soon be up against the ceiling.
