High voltage (70V) amplifier
I suggest you use driver chips for running high voltage devices. On of these chips are NCP5106-D that its input voltage is 3.3-5 volt and output voltage up to 600V . It's used as a Mosfet driver too, that can drive your Load.



For acquiring a dual supply from a single supply there are lots of chips such as 7805 and 7905 used together. Although if you run a current spike load such as motors, it's better to isolate ground from both sides. In this case you can use MinMax Voltage Isolators such as MAU3000 series.