1 First is: if in the new turn earned by building a wonder I can build another wonder?
2 Second question is: if my opponent passes with the military token the zone where I must pay two gold and I do not have that amount of gold, during the game if I earn two gold i must pay my debt to the bank?
1) Yes, your second turn is a full turn, giving you all the options of the first turn. Additionally you will turn over any cards that should be revealed from the set of age cards before taking your bonus turn.
2) No. The rulebook states you simply pay "all your coins" if you don't have the number you're supposed to lose.