Go to a track... when you manage to get through a whole tank of fuel without crashing and at a reasonable pace then you are ready for a new car!!! Just spend money on tires and bits that break!!!!
Dan is correct, spending money on this will leave you with a car that is more expensive than something like the Mugen MTX2 or Kyosho V1R but nowhere near the performance and durability! Better to go with a better car when you have figured RC is really what you want to spend money on, because the RS4 can become a bottomless pit with upgrades!!!!!
The RS4 RTR is fine as a starter car!! Enjoy!!!