There are many ways to learn how to make a good gelato. First learn Italian well with Living Language, then read one of the many Italian websites that explain you all the secrets for a good gelato.
OR
You can enroll to “Il ciclo di produzione del gelato artigianale e le norme igieniche da rispettare”, at the Università di Bologna (the oldest in the Westen World, founded in 1088….so Harvard guys, calm down: your college came about only 550 yrs later) a join venture with Carpigiani Gelato University. So, what are you waiting for? Summer will be over in just 2 months.