EA gimped tournament options eversince they've found the goldmine of "releasing tournament specific games"(Personally, hated them all except WC98 ), like EURO 2008, etc.
In real world, World Cup has 32 teams and European Championship has 16 teams(excluding preeliminary rounds of course). For
World CupYou can;
Game Modes > Tournament > Create Tournament > Groups&Knockout w/32 teams > Replace 32 pre-selected teams with intenational teams of your choice.
For
European Championship its pretty much the same deal except create a tournament w/16 and replace them w/ UEFA national teams.
I suggest you to find the list of qualified teams online(wiki should have it), create a tournament, save and load whenever you feel like playing again.
Note: You can't include earlier qualifying rounds because FIFA does not support a big tournament like that and there simply isn't enough national teams in the game. They released
Official Video Game of UEFA EURO 2008™ this game for that purpose.