Hi Gianluca,
Your English is fine (and so much better than my Italian)...
North and South is easy to get hold for Amiga:
http://www.games.amiga-island.de/North_And_South.zip
The latest WinUAE emulator can be downloaded from here:
http://www.winuae.net/files/InstallWinUAE0991.exe
All that remains is a Kickstart Rom to get the WinUAE emulator to work and as you're new, I'll give you the link but remember that this file isn't approved by Cloanto (who hold the Amiga license at the present time):
http://amiga.supergamez.hu/Util/kick13.zip
So... install the WinUAE emulator to your hard disk, unzip the kickstart rom and North and South ADF (amiga disk file or game disk) and in the WinUAE properties window that is the default screen, add the kickstart rom file to Hardware, Roms and add the game file to Hardware, Disk Drives, DF0: Click the Start button and everything should then work. If you need Winzip, go to
http://www.winzip.com
HTH
Bill