I'm really excited about this game! I can't wait to start playing it with friends. But I've got a couple of question about it
-If someone bid 1 for water and I want to go in jungle, do I have to bid more or can I bid 1 jungle?
You have to bid at least two. Your bid must always be higher than the formet best bid.
-This is more a question about the game itself. Since we can only draw 1 card per turn, 2 if we pay (which you shouldn't do too much if I understand), does it happen a lot that you can find yourself without a hand? does it mean you need to be cheap in bid?
It doesn't happen. Players usually always have at least four or five cards in hand, more often seven or eight. Only in the very last turns does it sometimes happen that a player burns his ships and makes a very high bid.
Furthemore, players usually have cards of different kinds in hand, so they can't spend them all on the same bid.