If you want a simple answer, get a Hobbico Avistar, a Thunder Tiger 46 Pro engine, and a Spectrum or Futaba 6 channel 2.4 Ghz radio and reciever. You will also need field gear- a starter and battery, fuel pump, and an assortment of basic hand tools. Expect everything to cost in the neighborhood of $500 including incidentals. You can get into the hobby cheaper than that, but that equipment list will save you money in the long run since the plane can do basic aerobatics and the engine and radio are good enough for higher performing and more complicated models.