I'm hoping I can learn a lot here. . .
I live in Central Wisconsin and we bought a Banana plant about 6 months ago when it was about 2.5' tall. We have cared for it and it has grown and is now about 6' tall. Obviously, it is indoors since Wisconsin is not the best climate for it to grow outside in

.
The person at the greenhouse where we purchased it said it will produce bananas and that is what we would like it to do. Now, in our home, it is 72 degrees all winter, and warmer in the summer. It is in a sun room with skylights and complete glass in the southern windows, so it stays pretty warm. We mist it with a spray bottle with water periodically as well. It seems to grow new leaves out of the top very often. It also has a small plant growing out of it near it's base that is about 1.5' tall now.
I would like to know a bunch of things about it:
1. How long does it take for a plant to produce bananas?
2. What will it look like when it's ready to produce?
3. Will this plant die once it produces bananas?
4. Should I snip off lower leaves as they start to turn brown, or just let them die and fall off on their own?
I have heard so many things about banana plants that I am unsure as to what is and is not truth. I have heard it takes 2 years to produce; I have heard that we must have 2 banana plants in order to produce (another person said that is not true). I have seen terms like "suckers" and "corms" and am unsure what these are.
Any help with the care of this plant, and expectations would be wonderful.
Thank you, in advance.