Assuming you’re making a Single-Sided board (set to single side board and design on the Bottom layer in Fritzing).
In CopperCam you’ll need to Flip the board Horizontally.
The Holes are on their own layer as is the contour and traces/pads… When you Flip it, check the box to flip all layers…
Recommend also resetting Origin (that will be Origin/start point of Mill-bit).
You can totally resize and reshape the pads, singularly or many/all). You may want only a few sizes.
Can set all holes to same size to reduce changing bits as it will normally want to select bits corresponding to diameters Fritzing generated. The problem is Fritzing parts (designed by different folks) end up with different diameters.
For Pads too close, there’s a separator tool as well for traces…
When generating the Gcode, select the layer and bits. Do it separately for Contour, Holes, Engraving (engraving = traces).
Good luck…