lipos are preety straight forward as use goes (hes more at risk running 4200s than lipo)
run. charge. run. charge. run. charge. (no discharging or eqalizing ) and if you have a proper lipo charger theres no risk for over charge.
if hes running a 2s lipo and he never drains it down to lipo cutoff he wont need to balance it all season. i run a few lipos between my rc8 and b4 and tc3 and i havent needed to balance all season everytime i put them on the balancer its still very close. (it may balance for 5 seconds or so )
heres the setup i suggest.
factory team t4
xbr 10.5 (for 19 turn truck personally stock is a bore)
orion carbon lipo. (if the track mandates hardcase lipos). if not maxamps 5000 2s pack (great power for the money and lots of runtime )
as far as radio goes. if your on a budget a xs3 does the job quite well. ( it has every adjustment he needs and has all the 75 fm channels built in )
servo (something peppy .10 and under ) dont skimp here.
charger. if your brushless your over paying for the ice and the checkpoint chargers. (they have motor breakin which you will no longer need due to brushless)
i run the triton 2 which i am very happy with. (does all the battery types even lead acid ) the triton jr would probably be perfect for him. and its cheap
thats the package i would get if i were starting out but thats just me.