Zikr & Dua

Q: Can istikhara be made of behalf of another person? I was told that this is against the sunnah and not established in the Qur'an and Hadith.

Q: I have a question regarding the beautiful names of Allah, is it sunnah to recite them for the zikr of Allah while expecting some benefit? For example, "reciting ya Rahman 100 time after every compulsory prayer makes you so and so". If it is not right then please explain what is the proper way of worshiping with the beautiful names. Also if you can recommend a Hadith will be very nice too?

Q: Is recitation of Aaya e kareema in congregation allowed in Islam or is it biddah?

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?