When choosing an internship, think about what you want to do as a career and find an internship that will help you advance in that field. There is little point opting for something that you have no interest in, as this will only leave you with a jumbled resume that you will then have to explain to employers back home.
For example, if you want to work in journalism contact the regional papers or online media and put yourself forward as a candidate. You may not be asked to write front-page exclusives but there is a good chance you will be asked to sift through documents or find a telephone number.
If you want to work in fashion, then consider the exact area you want to work in. Merchandising? Design? Retailing? Do your research carefully and send your résumé (curriculum in Italian) and cover letter to the human resources department, identifying the area in which you want to work. If you are available at any time, say so. But remember that Italy is generally shut down in August, so, if possible, avoid looking for a job in the summertime, you probably won’t find any leads!
If you don’t want to plan your own internship there are companies that can do this for you. The downside is that you have less choice over the company you end up working for.
Most local universities have career help for students, such as the Bocconi Career Service. There are also lots of online resources for internships, here are just two: