What I would do is look through the indice annuale nascite index of births by year find the name it will give a index number go back to atti di nascita for that year look up the index number you have written down for that person.
There are the same from indice annuale morti index of death records and indice annuale matrimoni index of marriage records which usually are listed by the grooms name first followed by the brides maiden name
Sometimes years are not indexed so checked the records themselves in the last couple of pages sometimes there is a index there for the year
One other thing with Italian records there is ParteI which is the normal filing of the record and there is ParteII which usually is in the back of the record year. ParteII happens if the civil official cant record the record for what ever reason in the date order its suppose to be in he starts another file (PARTEII) in the back of the record year
Like for instance i looked for siblings of Giovanna Lomonaco and came up with this
INDEX #975
1894 Oct 30th at 9:00 AM in the town of Caltanissetta, Sicily appeared Angelo Lomonaco and Guiseppa Asarisi gave birth in a house on via San Croce to a baby girl named Guiseppa Lomonaco
click for record keep clicking to enlarge
You will do great !!
Buona fortuna
Ciao
Marty Adelfio
Researching Trabia, Palermo surnames Adelfio, Bondi, Butera, Scardino,Rinella, Scardamaglia
Marty