Nikaah in accordance to the Sunnah

Q: I am soon to be married, insha-Allah. I want to know how to perform the wedding in accordance to the sunnah.

  1. What is the sunnah mahr and the amount in South African Rands?

  2. What is the Shar'ee status of having a wedding and calling people?

  3. When is the sunnat time for having the walimah? Does khalwah (in referance to the walimah) refer to seclusion only or does one have to have intercourse?

Nisaab of Zakaat

Q: A young Mufti (scholar) said to calculate zakaat based on gold. Now he changed his ruling and says to give it based on silver. So, based on gold, the zakat was 3000$. Today when he told the people to do it based on silver, todays silver price was 500$. So what must the people do on paid zakaat, count what is paid on gold as okay and from here on pay of silver?