If you selected an RTF model, you do not need any extra electronics and accessories as RTF models include everything you need to fly right out of the box. (Batteries for the transmitter and basic installation of plane parts are required.)
If you have selected a PNP model, you will still need your own transmitter, receiver, LiPo battery and compatible LiPo battery charger to fly. The advantage of a PNP is that once you have your radio transmitter, a battery charger, and several batteries and receivers, the PNP’s price is lower than the RTF.