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There are a series of small brass "buttons" on the outside bottom of the lens where contact is established. If a new lens, there may be some dirt or grease on them preventing contack. Wipe lens and camera buttons carefully with a lent free cloth and retry. Then it is time to go back to the seller.
Aperture problems on this lens are normally caused by grease on the diaphragm blades. The only solution is to dismantle from the back. When the iris is exposed wipe over with lint free cloth or cotton buds with a small drop of solvent such as lightr fuel or meths. Wipe over with a dry cloth afterwards. Get used to how to dismantle and reassemble the lens, you might have to do this more than once.
Please take your lens to a certified dealer. They can take it apart in a clean environment.
You should not try to clean / relubricate it at home, as this will most possibly do permanent damage to your lens.
You can. But do you have a lens collimator and other equipment needed to ensure proper alignment when you put it back together again? Without such gear, the resulting pictures will probably be worse than they are now.
Any way you want. The problem with fungus is that it etches the glass, which then has to be replaced. Unless you can find a stockpile of Contax 50mm f/1.7 Planar T* lenses for a replacement part, you'll have to buy another lens.
Let alone the recalibrating after replacing the lens element.