Never C-betting with air.

[00timh]

You can miss the flop with AQ/AK/KQ and still be ahead in the hand. In order for c-bets to be most effective you should vary your c-bets somewhat. check call, check fold, raise, re raise. Depending on your opponents and if you hit or miss the flop. The individual play of that hand to extract the most amount of money for that hand and the ones that proceed it.