CD4029 does not initialize at 0
Set Jam Inputs J1-J4 to 0V (pulldown) then give a short positive going pulse on Preset Enable.  That should set the all the outputs to low.  Once Preset Enable goes back to 0, pulses on the clock input will cause the counter to count up or down (depending on how you've set UP/DOWN.)

A simple, easy, and not terribly reliable way to do this would be to connect a 100nF capacitor from VDD to Preset Enable, and a 100k Resistor from Preset Enable to ground.  Powering on the circuit will cause Preset Enable to go high through the capacitor.  This is then discharged through the 100K to ground, bringing Preset Enable back to ground.