Various masaail of Nikaah

Q: I'm a 23 year old woman living in the United States and my fiancé lives in the Middle East. I've been engaged for a little over a year now. I will be married Insha Allah in summer. My question is, is it halaal for me to talk to him on the phone knowing that both our parents agree and know about it?

Q: Is there any sort of marriage (nikaah) that can take place purely and only for satisfying one's natural urges and desires? In other words, the man and woman only meet for this purpose and other than this, they both do not wish to shoulder any of the responsibilities of nikaah. 

Q:

1. Is it permissible to keep a wedding venue or invite people for food in a church hall, the hall is attached to the church but separate from the hall where the Christians have there prayers etc ?
2. Please explain in detail the reason if its not permissible?

Q: Why should I get married? Can't I stay alone and pray and do sajda and sadaqa in Allah's path. Marriage would lead me to gunaah and all?

Q: What is the ruling for the wife that hits her husband?

Q: If a married Hindu female converts to Islam then what will be the status of her marriage? Will it still be valid or would become invalid?

Q: When meeting one's potential spouse before the decision of getting married to the person, what in appearance will the person be allowed to see and what will be haraam to see?

Q: When visiting a family to meet a potential girl for marriage, is it permissible for the girl and boy to sit in a separate room and speak about their plans, requirements etc, since it is embarrassing to speak in front of all the family members? There is a big window to the room so people in the adjacent room can see everything that is going on, but they can't hear.

Q: Is is it allowed for the bride and groom to sit in seclusion before nikaah?