First of all, get a passport and other travelling documents. You can obtain your passport from any post office all across the country. You may have an entirely different procedure of getting passport in your country. Get a visa, if it is essential. Those who are citizens of European Union, San Marino, Switzerland and Monaco don’t need to obtain a visa, as they can enter Italy just by showing their National Identity Card.
Don’t forget to bring traveller’s check or credit cards. Both are accepted in Rome. If you don’t have plans to stay in Rome for more than just a few days, you can take cash with you. One can easily know the exchange rate through online newspapers.
Rome has a very strict security system, but still it is not 100% theft free. Therefore, you should pack a money belt in order avoid any problem. If you are uncomfortable with the money belt, use a hidden pocket.
Take a large bag, and pack clothes according to the seasons. Usually in winters, the average temperature in Rome is 09 degree Celcius. But in summers, the temperate goes as high as 25-30 degrees. So, bring clothes accordingly. Make sure all the clothes are comfortable.
Bring comfortable shoes. Travelling is not that cheap in Rome, therefore you may have to walk a lot around the city. Tennis shoes or any other comfortable trainers are best in this regard.
Bring appropriate clothes for visiting religious places. Rome has several religious places, and you need to wear particular dresses to enter those places. For example, male tourists are required to wear long pants, while ladies need to have their shoulders completely covered, when visiting most of the places.