Welcome back! Stock TT02 is a ton of fun, at our track (NORCAR Ohio) we allow ball bearings, front cvd’s and whatever body you think is cool. Full size 2S battery packs but you don’t have to use Tamiya plugs. Gearing, Motor and ESC as it comes in the box.. Flysky Noble are awesome radios, pretty sure they come with at least one receiver so you are good to start.. servo wise.. anything of a somewhat reputable brand in the $50/$60 range will do a great job.. spare parts? TT02s are pretty robust.. the occasional front and rear hub.. and the stock pinion wears pretty quickly..