I would recommend an OS 2-stroke for your first engine. Easy tuning and good reliability. A used OS .40FP or a newer used 45AX would give you plenty of power. Radios are a whole different ball game. Everyone has their own pet radio brand and consider everything else to be junk. I would recommend seeing what is prevalent at the club you joined/are going to join (don't skip this step) as they can help you with any programming/set up issues you might have and you will be compatible with their radio for buddy box training. My only recommendation would be to stick with a major brand (Futaba, JR, Spectrum).