1. You will want to take a look at page 13 of the User Guide.
2. There is a User Guide in the Italian language. If you set your iPad to Italian, under the "General" options for the Device Settings, the User Guide as well as Notion will appear in Italian. The User Guide is accessed by tapping the icon of the "?" at the bottom of the screen.
3. The Notion sounds are only accessible from within the Notion for iOS app. You can access them using a MIDI keyboard to play them back, but you will more than likely need to have a score set up.