help the noob

[xx4 fanatic]

Hey, my older brother just gave me his old xx4 which he hasnt used in forever. Its my first rc car, so i was just wondering what i should upgrade on it first since its all pritty dated. I dont think hes used it in like 4 years or more lol.

also i think i need a new power source or charger havnt figured out which is busted. could any one stear me in the right direction for a good one.