I agree with the post above to plant the first Engineer. That's quite a bit of production that early in the game. As for other Wonders, that depends on your game difficulty. If Immortal or lower, you can get a Petra too if you beeline for it or, if you don't have deserts, you can aim for Great Library or Hanging Gardens. I think, on Emperor or lower, you can actually get another Wonder on the second column of the Ancient Era techs if you are a big gambler like Temple of Artemis or such. Otherwise, Classical Age is where most of you future Wonders will be located.