procedure

Performing nikaah in a different language

Q: I had a few questions regarding nikaah:

1. What is the correct procedure for nikaah? What does it involve and how is it done?

2. If the bride's father is alive but does not wish to attend the nikaah, can the bride's brother be her wali? Is the nikaah valid without the presence of the father?

3. Does it matter which language the nikaah is performed - for example, if the bride or groom or witnesses do not understand what is said by whoever is performing the nikaah, is the nikaah valid? Also, does ijaab and qabool have to be said in Arabic?