where can I see wich flag belongs tot wich country?

Here --> http://www.playtheimmortalgame.com/help/index.php?help=flags

Also you can put your mouse arrow on a flag and a window should pop up telling you what country that particular flag is for.

At the bottom of the page there are numerous useful links. If you go to "site Map" under the help column you will find the link to the flag index.