Hi C; you'll be hard pressed on the first trip to 'do' Italy/Greece/France in two weeks. You've got lots of time to plan and my first recommendation would be to pick up a copy of RSteves "Europe Through the Back Door". Should be able to get a used copy at your library and it's not really important that it's the current version.
Rick'll give you great planning, itinerary, geography, generic information that you can expand on as your planning moves forward. It ain't the Bible but it's not bad for a first timer. Rick has a travel philosophy and writing style that makes this particular book stand out; but he's kind of unique and I say that in the most positive way. You just may not wish to travel 'his' way, but you'll not go too far wrong if you do.
ETTBD will lead you to many other information sources, including this website, but don't miss "Trip Advisor Forums", which I prefer to this helpline. You have so many more options on 'TA Forums' and many more 'locals' who are regular contributers. And if I want to know about Rome, I'd prefer my advice come from a Roman.
I'm not a 'cruiser' so can't speak to that method of discovering Europe for the first time. And I can't imagine that would be the way to do the first trip. Guaranteed you'll have fun and don't be afraid of the language, geography, custom issues that might turn some folks away from a self-guided tour.
With lots of planning you'll have a blast. BTW, I'm a WW2 history buff too and my last 3 trips (and one coming up in September) are directly related to that interest; give hubby some leeway.