Hi Tom and welcome
A big topic but here are a few starters, others will kick in I am sure.
Controller - or Transmitter as it is more commonly known
Get a 2.4Ghz frequency (most are) and get a receiver of the same make to be sure. Pick from Futaba, Sanwa KO Propo or Spectrum according to your pocket. They will all work well and until you get better you will not notice the difference. Most common are steerwheel transmitters but in the UK a lot of old school racers prefer a stick radio, if you have a preference go with that, otherwise get a steerwheel as the choice is bigger.
Speed control - often called an ESC or Electronic Speed Control will work with any motor so make is not important from that perspective but most will keep to the same make . Get brushless not a brushed motors and I recommend sensored rather than sensorless as the sensored motor/ESC are smoother and offer better control for racing. Good makes are Orion, Speed Passion, Vampire, Reedy, Hobbywing, Viper, Hacker etc etc.
Lipo battery - You will need one that fits the car, regular formats are stick, shortie or saddle packs and I think the RB6 copes with all types. maybe an RB6 driver could comment what is best. For 1/10th offroad racing we use 2S batteries and look for capacity over 4000mah and a C rating of over 50c. Similar makes to the ESC and Motors will all work.
Charger - There are hundreds out there, I used a Core UAC50 to start with, cheap and reliable I recommend it but there are many others that would do the job as well.
All these items can be got as cheap china made versions from Hobbyking and you can save a lot of money and the kit can work very well but most racers use branded stuff.
If you intend to race at a BRCA official event you will need to get batteries and Motors from the BRCA approved list
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