I am a dual Citizen from Argentina and

I am a dual Citizen from Argentina and Italy, leaving in the USA for the last 25 years.  My wife and I would like to retire in Italy and have a few questions: (1)  Where can we get information about income taxes for italian citizens?, (2)  Are we going to be "double taxed", (3) we have looked at seeking Italian citizenship for my wife here in the US but the system seems to be imposible to deal with so we are considering moving to Italy for 6 months and do the paperwork there. Where can we find the specifics of this?  Thanks folks!