Start by laying out every part from your kit and checking it against the included parts list. Identify the wings, fuselage, motor, ESC, battery, and controller.
Mount the motor and connect the ESC, then bind your controller to the receiver. Always test the motor direction with the propeller removed for safety.
Balance the aircraft at the recommended centre of gravity, do a range check on the controller, and choose a calm, open field for your first flight.