not trying to say you did wrong but i would of got a Ready to run car. and then went form there. if you looking for power well the biggest motor is not all ways the way to go its the battery esc motor combo that does the trick now if you are getting the best out there. i know a lot of ppl around here in SC that i know are going wireless with the servo and radio.
o just to fill you in the servo is what makes your car go left or right.
i got a off road rtr envder and a lot of ppl on the off road forums give me Sh#$# about it. but you know what i put a 5.5 hobby wings motor and a 60amp esc on it what a over sized 7.8 lipo 10000mah 20c battey and with a 19t p and a 84t s i can get 45mhp on the road and the only thing i have changed in the car is the motor and esc and the diff b/c i over tightened the the gear case.
cyclone s 8900K motor 30 A esc off brand
cyclone s stock esc and motor for a duratrax evader.
xbxrival 4wd tour car skyline body stock
duratrax evader ext 6600kv motor, eZrun 60A SL ESC
vintage traxxas hawk 11t custom motor, 30A blaster ESC