To power the receiver and servos from the d/f power battery, you need a speed control with BEC (Battery Eliminator Circuit). The BEC is a voltage regulator with 5 V output that is typically fed to the receiver via the throttle channel.

BECs are limited to less than 10 cells and two or three servos typically due to power dissipation. The ESC's instructions will indictate the number of cells and servos that the particular BECcan handle.

The green things are capacitors, used to reduce electrical noise from the motor. They should connect from each motor terminal to the motor's case with the shortest practical lead-length.