Various masaail of Nikaah

At what age should girl get married?

Q: I am a 19 year old female and would like to know

1. What is the right age for a Muslim women to make nikah?

2. According to the sunnah how should a woman find a spouse?

3. Why do the Ulamaa say its best for a pregnant woman to read Surah Maryam and Surah Yusuf during her pregnancy?

4. What are the benefit of reading those surahs?

5. Are there any ahadith saying that married women should live/stay with their in laws?

Marriage and destiny

Q: I have a question that confuses me often. I have read in the Islamic books that women is created from the left rib of the men and therefore matches are made before a person comes to this world. This means that each man and woman on earth has a match. Then what about the man who never gets married or women who never gets married when they have their match in the world. And if a person does not get married, what about his/her destined match? Does his match also does not get married? And those who pass away as a bachelor, does his women never gets married, as a person only gets married to those with whom they are destined to be with.