Dizionari

How to use a Dictionary.
You can easily find translation of any Italian words on your English-Italian-English dictionary: there are many good and very good edition of such a book (Italian and English publishers) and also on line:
Dizionario Ita/Eng 
Dizionario Italiano/Inglese Inglese/Italiano
You can also install an applets or add-on for your brower giving an immediater translation hovering on an Italian term: check for "instant translation addon"
Dictionary I recommand is DOP Dizionario Ortografia e Pronunzia:  potrete udire la pronunzia esatta delle parole (use it to learn the correct pronunciation of a word (stress, phonetic espression for O and E large or narrow sound)

Dictionary to use to work with italian texts:

La repubblica: dizionario Italiano (use it to find Italian description of Italian terms)
Sinonimi e Contrari: Synonyms and opposites (use it to find all different meanings of single word)