Should I use the .died function because my script isn't working?

ZombieA gets spawned into workspace and inside ZombieA I changed humanoid to Zombie. This script is for when the Zombie dies, it doesn't matter if everyone where to get money because it's a 1 man server.

local Zombie = game.Workspace:FindFirstChild("ZombieA")
local player = game.Players

if Zombie.Zombie.Health >= 0 then
	player.RealMoney = player.RealMoney + 2
end

Try this:

local Zombie = game.Workspace:FindFirstChild("ZombieA")
local player = game.Players.LocalPlayer

if Zombie.Zombie.Health == 0 then
    player.RealMoney = player.RealMoney + 2
end

local Zombie = game.Workspace:FindFirstChild("ZombieA")
local player = game.Players.Localplayer
Zombie.Zombie.Changed:Connect(function()
	if Zombie.Zombie.Health == 0 then
	    player.RealMoney.Value = player.RealMoney.Value + 2
	end
end)