Creating a 'World Diaspora' annual league

[Oggimon]

I am wanting to create a league using the teams from around the world that form the diaspora for a country.

Teams would be from Australia, Canada, Germany, Sweden, Italy, and a couple of others. Teams from these nations are all MINOR clubs that arent exactly part of the league system, but instead are part of the 'lower divisions'.

I am also wanting to include Croatia as a place where clubs are pulled either from lower divisions or from a competition.

How would I go about setting up this? 

The teams for all but Croatia would be the same yearly, but the Croatian one, I would like to be from a competition, if possible.

Thanks all!