Should we lead aces? There are many circumstances whereby we should not lead an ace!
If partner did not overcall or opened the bidding one should NOT lead an Ace if not supported by the king. Ace's are meant to capture Kings. Do not lead Aces from spaces! Even though partner opened the bidding, one should not lead an unsupported ace, after all partner does not guarantee the King in that suit.
Exception: If partner overcalls a suit for a lead, then we lead the Ace from Ax or Axx. Do not lead away from an Ace in a suit contract.
With not much information from the bidding, try to avoid those suits if possible.