Settling one's debts before giving nafl sadaqah

Q: I will be receiving about R50 000 in inheritence. 

I am married with 4 kids but my husband doesn't always provide. I work, and earn a basic salary and most often I am paying for my children's clothes or treats etc. 

I want to give 10% of my inheritance in charity, however I do have debts to pay and most of the time, my money is all finished and I can't buy myself anything. 

Is it better to give out the amount as sadqah or better to pay off my debts and my zakaat which is due and keep the rest as an emergency nest.

Performing qurbaani while one is a musaafir

Q: For Eid, I'm going to see my family abroad. I'm only going for one week so I will be a Musaafir. One condition of wujoob for Qurbaani is that a person is a Muqeem. I am planning to do zabah of an animal there. 

The question is what intention do I make? Is it Nafl? If its Nafl, can I then do esaale thawaab of it instead of doing it from my own side? Or will it become waajib when I buy the animal even though I'm a Musaafir?

Reciting Surah Waaqiah in the sunnah salaah after Maghrib

Q: If we make a habit of reciting Surah Waaqiah in the sunnah of Maghrib, would it be against the sunnah practice as our beloved Rasulullah (sallallahu alaihi wasallam) was not doing it like this? Similarly, we have been informed of the mas'alah that it is not correct to fix a particular surah for a particular salaah, so by reciting Surah Waaqiah in the sunnah salaah, we will be fixing it. Is this correct?

Returning home for a janaazah after donning one's ihraam

Q: What is the ruling for the following scenarios? 

1. A man puts on his Ihrām and goes into Makkah. When he checks into his hotel, he receives news of the passing away of a family member, hence he flies back, in Ihrām, for the Janazah, thereafter returning and commencing his Umrah. Is there anything due upon him? 

2. A couple are going for Hajj. As they don the Ihrām and are about to enter Makkah, the wife's menstruation commences, which will end on the 7th of Dhul-Hijjah, hence after the completion of the husband's Umrah, they decide to spend the remaining time in Madinah. Is there anything due upon the wife?