To sync up sound try putting both audio tracks in the timeline stacked and then zoom in on the waveform. You should be able to see where the waveforms line up. You could also look for a visual cue (i.e. light flashing, something dropping, etc…) that shows up on all 3 cameras and sync those visually and the audio should follow.
To to a quick down-and-dirty color match, try adding the 3-way color corrector and grabbing the color picker next to the highlights color wheel. Click this on your canvas image on something that should be white and you should see some instant results. Do this to all 3 angles and they should match up reasonably close (hard for me to say without seeing the footage).
That being said… You will almost always have to do some color correction with multiple camera shoots, really even single camera shoots with different setups.
Hope this helps.
-Todd Beabout
Vazda Studios