Welcome to the fold! Here is a list of things that might be useful. I'm not going to say that you need to have them...they are nice to have. The truck is pretty decent for racing right out of the box, especially if you are just starting.

Factory Team hex driver set - kinda stupid-expensive but it's got all the tips you will need and you can stick the tips into a power screw driver too - ASC1655
RPM ball cups - much tougher than the stock units, this is as close to a must have as you can get - RPM73372
A spare set of front arms - they are different if you have a 10.2 vs. prior models..make sure you get the right ones.
Different shock oils for tuning

This list could go on forever. If you are really just getting into the hobby and would like some advice feel free to PM me and I can get you a more in depth list of tools and such.