5 cities in 11 nights is insane pacing. You are new to European travel - even if you spent 1 week in France and 1 week in Italy, you will get an extremely limited taste of these countries.
Suggestion 1: 4 Nights Paris, 2 Nights Venice, 2 Nights Rimini (Adriatic beach town), 3 Nights Rome
Suggestion 2: 7 Nights Paris (including two day trips to coastal Northern France and Versailles), 4 Nights Rome
Suggestion 3: 6 Nights Paris (including one day trip to coastal Northern France), 2 Nights Brugges, 3 Nights Amsterdam. Save Italy for a separate trip.
All of the above assume you fly open-jaw into Paris and out of final destination city.