I think the "big thing" regarding new brakes is to realize that material from the new pads can adhere to the new rotors if improper braking practices are used out of the gate.
For instance: Making hard braking stops coming to a complete stop with the pedal pressure being maintained fully through the whole "stopping" experience. Best practice is to release the brake pressure just prior to stopping, then reapply the brakes to finalize the stop.
What happens (if you continue the brake pressure on the hot pads and rotors) is that particles of the brake pads bond to the rotors and then become part of the rotor, contamination if you will, and cause problems such as less braking power and more aggressive wearing of the pads & rough and uneven rotors.
Releasing the brakes just before coming to a complete stop provides a slipping release of the pads from the rotors and leaves no deposits on the rotors.
This is really a good practice whenever doing hard stopping, not just only for new pads and rotors.