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For a CP helicopter, you will want to program the idle-up mode on your transmitter before attempting forward flight. This will improve the collective response of your helicopter, which is required to maintain level forward flight.
The idle-up mode allows you to keep a constant headspeed regardless of the throttle position. This allows you to decrease and increase the main rotor blade pitch without losing headspeed. This makes the helicopter more responsive to altitude changes because the motor will not change speed when the throttle stick is moved.
To set the idle-up, first look at your normal throttle curve, and note the maximum throttle. For example, if your normal throttle curve is 0-50-85-85-85, then your max throttle is 85.
Next, switch to the throttle programming menu for the idle-up mode. Set the throttle as a straight line across for the maximum value in your normal throttle curve; in this case it would be 85-85-85-85-85. Now, when you spool up your helicopter, you will do it in the normal throttle position until you reach full speed. When the full speed is reached, you will flip over to the idle-up mode to start flying. When you land (or crash) and need to turn off the motor, use the throttle hold switch. This will require some practice.
Be sure to copy the pitch curve from normal mode to idle-up mode to eliminate the "hop" which may result when switch back and forth between normal and idle-up modes.