You find the surface area of each individual face - whether plane or curved - and then sum all those areas together.
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NO. This is the way to get the volume of a prism, not the surface area of any three-dimensional figure. To find the surface area of a three-dimensional figure, you must find the area of each of its faces and then add the side-areas together.
Its total surface area.
The surface area of the 3-D figure will be the total of the areas of the 2-D figures.
No. An area is always two-dimensional. It doesn't matter whether you are talking about the area of a square, a circle, an ellipse, or any other flat figure; or the surface are of a three-dimensional figure such as a cube or sphere.
That's the area.