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?

Q: While in sujood, can I make dua in my own language? For example, I ask Allah's help for my work, or ask for betterment for my family's health or ask for jannah? If yes then in nafl sujood only or even fard/sunnah?

Q: Can a person make due and beg for Allah Ta'ala to gorgive them in English or does it have to be in Arabic?

Q: What will the language of Jannah be? Will it be whatever one desires?