Prevent yaw
Airspeed - Blue line if climbing
Identify the faild engine
Decide if an immediate shut down require (fire, oil leak or below 1000ft AGL)
Open (Throttles fully open/max permissible power)
Find the cause
Feather if the problem is not resolved
Secure the failed engine
Tanks - consider requirement for crossfeed
Airframe - configuration (rudder trim, cowl flaps etc)
Replan (ie land at nearest suitable airfield) and radio