Need information regarding the certificato di residenza

Hello, I am planning on spending a few months a year in Italy and wish to buy a car to use while I am there, my understanding is that I will have to get a certificato di residenza as well as a codice fiscale, I already have the codice fiscale, and looking into getting the certificato di residenza, what I am looking for is information regarding the bureaucracy I am getting myself into if I get the certificato di residenza, like, what sort of taxes will I be required to start paying? Will I be required to pay income tax even if I don't work in Italy?

Thank you.

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