(2) Can one recite Ayatul Kursi after Surah Fatiha? If yes, does one need to recite additional ayah or Ayatul Kursi alone is good enough before proceeding to ruku? I appreciate if you provide some references in this regards as well.
بسم الله الرحمن الرحيم
(1) It is wajib to recite at least three verses of the Holy Quran or one long verse after surah Fatiha in the first two rakah of Fardh salahs as well as in each rakah of all the other salahs for Imam and the person offering salah individually.
ومنها ضم السورة أو ما يقوم مقامها من الآيات التي تعدل سورة إليها أي إلى الفاتحة الخ (حلبى كبيرى، ص: 296، ط: زكريا)
(2) It is sufficient to recite Ayatul Kursi.
Allah knows Best!
Darul Uloom Deoband
This answer was collected from the official ifta website of Darul Uloom Deoband in India.