You would use the water displacement method. Place an overflow can in a container that can catch the water that flows out of the can. Fill the can completely full of water. Place the figure in the can, and collect the water that flows out of the can. Measure the water that overflowed with a graduated cylinder, and that will give you the volume of the figure in mL. Since 1mL exactly equals 1cm3, you can also know the volume of the figure in cm3.
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You get the Volume by using formulas. There is usually a specific formula to find the volume of each shape. Some irregular shapes may not have a formula.
2D figures have surface area, but no volume.
Yes
Zero is. Plane figures have area but no volume.
A rectangle is a 2-dimensional figure. 2-d figures do not have volumes, which is a 3-dimensional concept.