Essential stuff for a 1/10 set up

[tumpier]

Started racing nitro last year(not that good lol),bought a b4.1 rtr and been to kiddy a couple of times practicing,should I get another chassis(seen a second hand dex 210 on here(what sort of price would get it running I have servo and receiver),how many batteries do people take to a meeting,what chargers( got a charger but I do not think it connects to a battery)any help or advice gratefully accepted cheers mark