if i don't like my first hand, i could reshuffle and redrow another hand before start the game?

Yes, you get to do this once. It's called a "Mulligan"; the respective rule is found in the Tournament Rules document.

~at the first sign of drow, I wouldn't worry about shuffling my deck - I'd run!

radiskull said:

Drizzt Do'Urden would be displeased at your response to his appearance Radiskull.