Qualities of the Imaam

Q: Is salah valid if it is offered in:

1- Ahl-e-Hadith musjid?

2- Jamaat-e-Islami musjid?

Q: What is better, to offer Salaah behind a temporary Imam who don't have a beard and his pants are below his ankles and I am not sure about his level of Islamic knowledge or alone without jamaat?

Q: If the Imaam of a musjid writes taweezes and gives people taweezes , then is his salaah valid and is the salaah of those who perform salaah behind him valid?

Q: Is salaah valid if the Imam is wearing pants below his ankles and don't have a beard?

Q: I would like to know about the priority in a jamaat for a person to lead a prayer, if among 10 persons, 9 of them has one fist beard but the other one his beard is shorter but his tajweed, knowledge and age is more than the other 9 people. In that case who is eligible first to lead the prayer.

Q: I was watching a religious show on TV, there was this Mufti who said that we should not offer Salaah behind a Deobandi since they say bad things about Rasulullah (Sallallahu Alayhi Wasallam). How should we reply to such people?

Q: What is the ruling regarding one who misses the jamaat and joins a masbooq while he is performing his missed rakaats? Will the salaah of such a person be valid? Similarly, can one perform his fardh salaah behind a person who is performing his sunnat or nafl salaah?

Q: I am Islamically 14 and not sure if I am baaligh. I have released mazi and probably wadhi but not mani. Am I baaligh and can I perform Salaah as an Imaam?

Q: A married person who is secretly in contact with another unmarried woman but he is an Imam of a masjid also, Salaah performed behind him is valid or not?

Q: If musallees walk out of jamaat salaah just because they think the Imaam is arrogant and they have issues with him, is this correct? Some who feel the same still pray in the masjid behind him but then go home and repeat it. Is this correct?