for your next class, youd have to pick that yourself... what interests you more, etc.
for the second, the holy avenger is with Firkraag... remember him? hehe as for the crom faeyr, yeah, he also has the scoll that contains the name "Crom Faeyr" very important... youll need the hammer of thunderbolts girdle of frost(?) giant strength and... i forgot. just explore well, you will have no trouble with it. its not that hidden, but youll get it very late in the game...
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I...AM...BAHAMUT...AND IT IS YOU PEOPLE...I FEAR