Usually if it is night,and you don`t have flares/NVG/BIG LIGHTS,or over the sea/IMC,or anywhere you are uncertain of the surface,at about 30-40 ktsIAS,wait until you see the ground/rad.alt(if you have one),then ,about 40-50 ft,kill the speed,and pull to the top...and hope...
As per AC above...
and your RRPM will be lower than normal autos...