What is the ruling on making up an unknown number of days from Ramadan, due to the questioner's ignorance of the impermissibility of nocturnal emissions while fasting, along with his repentance for that?

If by "nocturnal emission" you mean masturbation, and you engaged in it during Ramadan, unaware of its prohibition and that it invalidates the fast, then according to the stronger opinion, you are not required to make up for those days. Masturbation is forbidden, and its prohibition is more severe in Ramadan. Hasten to repent to Allah and do not return to it.