What is the easiest and legal way way of getting a residence permit in Italy?

You may start with this website: Governo Italiano: Home page (http://www.governo.it/)
I can't read Italian... if I were you, I would consult an Italian immigration attorney.. you can find many online.

Dear Sir,

I am Attorney certified in Italian Immigration & Citizenship law. I speak English and Italian.

I can help you about your case. You can contact me to my e-mail address [email protected].

My website is Avvocato specializzato in diritto dell'immigrazione © (http://www.avvocatoimmigrazione.com)

Sincerely,

Avv. Marco Mantovani

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