I am from Rome.
'Sono' = SO-no; 'Roma' = RO-ma. Both words have stress on the first syllable.
State your city of origin immediately after your name. It is one of the most expected pieces of information in any Italian introduction. Adjust the preposition and form based on context.
'Sono di' + city name is the standard A1 structure for expressing where you are from. It is distinct from 'Sono a Roma' (I am in Rome). If you are from a country rather than a city, 'sono + nationality adjective' is more natural: 'sono italiano.'
Vengo da Roma.
I come from Rome.
'Venire da' is equally common and slightly more dynamic in feel.
Sono romano/a.
I am Roman.
Use the city adjective — sounds more natural and expresses local identity.
Sono originario/a di Roma.
I am originally from Rome.
'Originario/a di' suggests you were born there but may no longer live there.
The rivalry between Rome and Milan is a running joke in Italian culture — Romans are stereotyped as laid-back, Milanese as workaholic. Saying you're from one city while living in the other always prompts a smile.