The niyyat must not be pronounced with the tongue.There is no recitation of the (second) Surah and no qunut (even if the Salatul Ihtiyat is two rak'at).According to Ihtiyat Wajib, the Surah al-Fatiha must be recited quietly.ISSUE 283: If one rak'at of Salatul Ihtiyat becomes wajib, after the sajdahs, the tashahhud and salam must be read; and if two rak'at have become wajib, the tashahhud and salam must not be read after the first rak'at, rather, one more rak'at must be performed (without a Takbir to start the second rak'at), and at the end of the second rak'at, the tashahhud and salam should be read.
Sajdah Sahw
ISSUE 284: In the event that sajdah sahw becomes wajib; for example, a doubt occurs between the fourth and fifth rak'at, in the state of sitting after the salam of the Salat, one must go directly into sajdah and reciting the following:(بسم الله و بالله السلام عليك ايها النبي و رحمة الله وبركاته) then sit up, go back into sajdah and once again recite the above dhikr, sit back up, then recite the tashahhud and salam.