Welcome to Gente.
My grandparents came to UK from Italy in the late 1800 (from an area quite close to Cassino) and they first settled in London before coming to Scotland around 1902/1903.
facilities and using your Local Family History Centre, films containing records of on births, deaths and marriages can be ordered, (not expensive to hire the films) but you must go to your nearest F.H.C. to view them but they are recorded in Italian. Even if you cant read Italian there are lots of information available in English to help you find the relevant details and there are lots of nice people here at Gente who would be more than willing to translate documents for you.
Using the above link if you scroll to the bottom of the page and type in your details it will give you a list of your nearest F.H.C. where you can order the films.
This next link shows the list of films availbale for Cassino in Prov. Frosinone
(I think this is the correct spelling - Margherita)
Hope this helps you get started. Dont forget though once you start finding information you wont be able to stop searching for more:D