Alas, I know more about cooking and eating them than growing them. :)
However, I do know that you need to plant or have oak and/or hazelnut trees, and of course the alkaline soil in which to grow them. I suppose you could make it alkaline with some crushed limestone, but you would need to know the correct amounts.
I thought there was quite a push in the EU to cultivate them? Surely, they've published some guides? I think you'd need some specialized guidance, because they're temperamental.
I don't know how it is in Greece, but in Italy it's rare that you get to go out with a truffle hunter, because they're very secretive about "their" places.