Ah, the merry entusiasm of a green modder. Welcome to the world of challenges

(which in no way is just about restrictions but solutions just as well, to be fair

)
The Clouds of The Ring - can't be done without hard coding (illegal). Engine limitations.
The Power of The Ring - can't be done without hard coding (illegal). Engine limitations.
The Flames of The Ring - you may add the greek fire too him. Never attempted to give such to any unit but assume there's no problem, beisde possibly a lack of animation?
See here:
http://www.twcenter.net/forums/showt...ght=greek+fire
The Call of The Ring - you can't spawn units on the battlefield like that.
The Whip of Balrog - can't be done without hard coding (illegal). Engine limitations.