Is it permissible to quote and rely upon information found in Shia kitaabs?

Q: I recently received e-mails and other whatsapp messages which claim that some years after Hazrat Husain (radhiyallahu anhu) was killed, the Shia of Kufah came out seeking revenge for his death. Apparently, the leader of these Shias was Sulaimaan bin Surad, and they were named ‘Tawwaaboon’ (the repentant ones). They fought against Ubaidullah bin Ziyaad and most of them, including their leader, Sulaimaan bin Surad, were killed in this battle. The information quoted in these messages has been taken from kitaabs of the Shia. Is this information correct, and is it correct to quote from the kitaabs of the Shia?

Nose surgery

Q: I have a very wide nose. Whenever I look at my nose I feel stressed and low confidence when meeting with people. My intention is not to look beautiful but I just want to get confidence. Can I undergo nose surgery to make my nose little smaller.

Is becoming a good person more important than performing salaah?

Q: I have some doubts in my mind. Mostly people say offering prayers is the first thing every Muslim should do even if he is committing any sin. I have a question does Quraan really say that offering prayers is the first priority and becoming a good peson who does good deeds is secondary thing because in todays world we see many people who offer prayers but commit sin and on the contrary there are people who are good human but dont pray. So I really want to know what Allah says about this is becoming a good person more important or offering prayer. Although I know that mostly people say that through prayers one can only become a good person but what about those who perform good deeds but dont offer prayers that too often