Persoanally i would:
Power up the controller and the heli; disconnect the motor though.
Center all trims.
Adjust the heli until the swash plate is flat (perpendicular to the main shaft in both elevator and aileron directions.
Test.
Trim transmitter until you counter the natural drift tendency (should be much much less once the swash is flat).

But i know nothing of that particular heli, this is just generic heli suggestions.