how do I make coins appear randomly on the my map? + Game saving questions

Hello! So, I'm making a coin system in my game (a game that simulates a race). I created a part of a coin and added a counter. But now I would like to make these coins (part) appear randomly through the race and keep moving (example: left, right, up and down), and I would also like to know how I save this information so that the player does not lose his money when he leaves the game

accountant script:

game.Players.PlayerAdded:Connect(function(plr)
    
	local paste = Instance.new("Folder",plr)
	paste.Name = 'leaderstats'
	local money = Instance.new("IntValue",paste)
	money.Name = 'money'
end)

coins(part) script:

local debounce = false
script.Parent.Touched:Connect(function(hit)
	if hit.Parent:FindFirstChild('Humanoid') then
		if debounce == false then
			debounce = true
			local player = game.Players:GetPlayerFromCharacter(hit.Parent)
			player.leaderstats.money.Value = player.leaderstats.money.Value + 1
			script.Parent:Destroy()
		end
	end
end)