Help wanted With My GTA top down game

I am working on a top down GTA style the game is based on a guy named Andre Johnson all odd are against him i am looking for help with the structure the game i have cars moving i have Npc’s moving I have a map a really big map i suck a math so i I might need help with that i have a radio station in game you can drive around/ walk around
if you want to join me contact me at making my game
Dlightgoodmen@gmail.com