Yep a starter box is required but I prefer that over my pull starter I don't race just mess around the yard with it now.
http://traxxas.com/sites/default/files/5360X_Revo_INST_121218_1.pdf
You probably got the instructions with your kit but just to make sure.
Here is a couple of pics mine...
I used this Big Block Kit with a Picco .21 and everything meshed up fine I am not sure if they are still even making them anymore.
http://www.qoncepts.com/RCpages/TraxxasRevoRBBC.htm