Make sure your pedals are tight and/or try different ones for sure. If they're not completely tight, pedals will make noise.

One troubleshooting trick (if you're running a freewheel) is to get rolling then pedal slowly (not enough to engage the freewheel) and you can tell if the noise is a direct result of torqure being applied or simply turning the cranks. You can rule out things like chainring bolts this way.