In Italian 2 learning Passato prossimo can be the biggest challenge. A great tool to use is wordreference.com. It is an online dictionary.
When you enter the word in Italian it not only gives you the definition it also has a hyperlink to the conjugator which lists all the tenses and their conjugated forms.
One more tip when using essere in Passato prossimo. You must use gender/number agreement based on the subject of the sentence.
Gianni e' andato a casa. Masculine subject/ note the end of the verb with the letter "O".
Gianna e' andata a casa Feminine subject./ note the end of the verb with the letter "A".