1- If the skin of the lips was about to fall and not ripe, then it’s pure. But if one pulls it out while still fresh, it’s najes and haram to swallow it.
2- If you know that the owner is ok with you keeping it, then you can keep it and no need to inform them, and Allah won’t hold you liable on the Day of Judgment.
3- Yes doing so will earn you a maximum amount of reward.
4- If they gave you permission and they are not hurt by you moving out, then it’s ok for you to move out, even if they’ll face some difficulties.
5A- In those situations do your best to estimate how much their Khums would have been. If you are undecided between two amounts, go by the lowest one.
5B- This is correct, but you still have the option of doing that once a year not every month. It’s up to you.
6- If your father paid Khums regularly, but it happened so that he did not pay the khums of this property then you must pay its Khums when you receive it as inheritance. But if he didn’t pay Khums (out of negligence or not believing in it) then you don’t have to pay Khums on it.
7- It’s permissible
8- You don’t have to read from it, though it’s recommended to do so. And you can go to the washroom with it as long as in your society it’s not seen as disrespectful to the Qur’an.
9A- Yes apparently it includes all liquids.
9B- The new Islamic day starts at Maghreb when the sun sets. Hence the lunar months start at night, not at Fajr or sunrise. Friday starts Thursday Maghreb.
10- If one’s bodybuilding is for the sake of Allah and a wise purpose, and it requires eating more then it’s fine (but even then the amount of eating should not be excessive). If it’s for worldly reasons then it’s Makrouh.
11- Yes it applies to Qadha as well