You'll need a motor, speed controller, battery, receiver and two sub-micro servos.
There are many different types and sizes of these items, but this is what I use:
1 Thunder Power 1320-2S-TP LiPo Battery
1 Thunderbird 18 Brushless Speed Controller
1 ARC-20-34-110 Brushless Motor
1 4 Channel Light Flight S4 Receiver
2 Blue Bird BMS-306 Servos
I bought these items from Light Flight RC