The sunnah of azan shall not be performed with recorded azan. For the fulfilment of sunnah azan, it is necessary that some Muslim calls azan. You should try to offer salah with jamah after sunnah azan. If you offered salah individually salah shall be valid but you shall be deprived of the reward of jama’ah.
(1) In case of offering salah with jama’ah such person should be made imam who is perfect as per the Shariah i.e. keeps full beard, is aware of the masail of salah, recites the holy Quran correctly and has correct belief as per the Ahl Sunnah and is not a Barailavi or Ghair Muqallid. If you are unable to offer salah behind any imam with true belief then you may offer salah behind Barailavi or Ghair Muqallid accidently, and you shall get the reward of jama’ah, though your salah shall be makrooh tahrimi.
(2) Yes, your salah shall be valid. You should not miss jumuah salah so far as possible.
(3) If salah is finished then you may offer Fajr salah individually after offering two rakah sunnah.
Allah (Subhana Wa Ta’ala) knows Best
Darul Uloom Deoband