Zikr & Dua

Q: Please can you tell me the full benefits of ayatul karima?

Q: I came across a durood called durood-e-faatih. I would like to know if it is authentic. From which hadeeth?

Q: I know certain time you can't pray salah like as sun rising, sun going down but can you make dua at those times?

Q: I have a question that praying the wazifa Ayat-e-Karima is wrong or right? I have been reading that this wazifa is powerful and helps us in difficulty and gives us relief and I would like to know is it right and could you please give me more details on it?

Q: Is there anything wrong with this du'a?: "Oh Allaah, save us from destroying our aakhirah"?

Q: How should we send our Salaam to Rasulullah (Sallallahu Alayhi Wasallam)? And please let me know of the following:
Is it sunnah to recite surah niba after asar and surah fajar after fajar?

Q: I wanted to know that is salaam i.e. Assalatu wassalamu alaika Ya Rasoolallah allowed or prohibitted?

Q: What dua should I read to conceive my third child?

Q: Can we make dua by taking the wasilah of Hazrat Muhammad (Sallallahu Alayhi Wasallam)?

Q: 

1. A person I know is stressed due to his brother having cancer and keeps on worrying for him. He finds it hard to concentrate on his family and work. Is there any dua I could pass on to him so that he is less stressful and could concentrate on his family and work?
2. The patient does not know that he has cancer as they haven't told him, is it ok if they keep it hidden from him?
3. Please give me a dua for that cancer patient?