at the end of October the English release of the game will be available, but the cards should be published also in French, German and Spanish, therefore it will be easier to understand how to play the game. See the news at: www.fftradingcardgame.com/en
In the past, I have built some decks derived from the Japanese starters, which have been printed only in the first few sets, up to Chapter IV. They work and they are rather balanced, so I just changed a few cards in those decks.
I have always used two "colours" (elements: Fire, Ice, Wind, Earth, Lightning and Water) decks because the starters are all built in this way, but I am pretty sure that a one-type deck can be stronger.
The balance among the card types changes because each element has its strengths and weaknesses. Normally, the majority of cards must be Forwards, with just a few Backups and Eidolons. The last sets introduced other types (Monsters and Items) but I have not played (yet!) decks based on the latter Chapters.
I will collect the English version, when it will be made available, and I hope to be able to add it to the TCOL website, as I did for the Kingdom Hearts and the Final Fantasy Japanese TCG.
I hope to trade with you some cards and some more advices