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26 nations are arranged in leagues using latest FIFA rankings. 211 FIFA members + 15 non-FIFA nations. Games are played from january to december.

-All other senior international competitions are disabled - also there is no friendlies anymore-

FIFA Gold League - 12 nations - 1 relegated, 4 in relegation playoff

FIFA Silver League - 12 nations - 1 promoted, 4 in promotion playoff ,1 relegated , 4 in relegation playoff

FIFA Bronze League - 12 nations - 1 promoted, 4 in promotion playoff, 1 relegated , 4 in relegation playoff

FIFA League 1 - 20 nations in 2 groups - 1 promoted, 1 relegated , 4 in relegation playoff

FIFA League 2 - 40 nations in 4 groups - 1 promoted, 1 relegated , 4 in relegation playoff

FIFA League 3 - 80 nations in 8 groups - 1 promoted, 1 relegated , 4 in relegation playoff

FIFA League 4 - 50 nations in 5 groups - 3 promoted + 1 best ranked 4th team

FIFA Cup of Nations - 226 nations in cup stage - 1 match, final on neutral stadium

U-21 leagues are arranged same as senior leagues

If you want to have more players in smaller nations or U-21 squads you need to load more players-choose advanced here:

You can choose "Current international players" and "Players from top division clubs" but these 2 options will load over 80k players. Its up to you and your PC 

출처:https://community.sigames.com/topic/423595-fm18-fifa-nations-league/