I have my Visa S1 for family reunion.

First, you need to prepare the following materials: your passport with at least six months of remaining validity and with blank pages, a photocopy of its date page, a completed application form affixed with a recently taken photo, a photocopy of your husband's passport and residence permit of long period, the original and photocopy of your marriage certificate, an invitation letter from your husband in original copy. Then you can go to the CVASC branch in Roma or Milan to submit the application. By the way, you should go to the local PSB to apply for a resident permit after your entry within 30 days.