2. This is not clear, sorry.
3. The life span of pilots is not very long, and the risks are great. Moreover, banks will not lend money to pilots, because the occupational risks are too great, insurance is not easy to buy, and it is difficult to find an object.
4. You can take a vacation. It's paid by class. For example, a few thousand dollars can fly a passenger plane back and forth, during which you can take a vacation.