Charge both the Mavic Pro battery and the controller. The Mavic battery plugs into the power supply (the charge plug is reversible) and will start charging automatically. When the Mavic battery is done charging, the lights on the battery will turn off. To charge the controller, plug a micro USB cable into the left side of the controller and plug the other end into the Mavic power supply. You can also charge your smartphone using the extra USB port on the power supply.
Get ready for takeoff by calibrating the compass. The compass is what tells the drone what direction it’s facing, so you need to calibrate it every time you move to a new location (Like going from your house to the nearest mountain for example). If the compass needs calibrating the app should tell you automatically, but it’s better to calibrate it often to insure that the Mavic is flying as good as it can.