I always carry:
front and rear wishbones
C hub front 4 degrees (std)
long inner hinge pins
87t spur gear
long/short belts (never broke one yet, same on TC5 but it is the day you do not have it that something will happen, sods law)
diff gear (same on diff and spool)
dog bone bearings (because they are quite fragile)
spur flanged bearings, just in case and screws that fits them (because I have lost two already)
this is quite extensive but I race at league level. I actually carry more but this is a good list to start with.
Put a tiny amount of threadlock on those two spur gear screws and check them regularly.
You will probably have to invest in some shock springs depending on your track.
Enjoy racing with your new "baby"