For the best possible consistency, orient the sensor window on your remote Speedlights so they are aimed at the Master (Commander) Unit. As for settings, the possibilities are endless. You can use light modifiers (umbrellas, soft boxes, etc....) If you are indoors with light colored walls and ceilings you can even place the remote Speedlight behind a wall and the light (flash) reflected off of the walls or ceiling will usually trigger the remote.
Experiment. Find out what works best for you. Good Luck and Enjoy your Nikons!