Data storing items?

Hi, I was playing a game and I bought some particles then left then re-joined the game and I still had my particles. I know this is datastore because I've used datastore, but I only know how to store number/string values. I was trying to save items but my script didn't work. Can you please tell me what I did wrong?

game.Players.PlayerAdded:connect(function(player)
	local stats = Instance.new("IntValue",player)
	stats.Name = "leaderstats"
	local credits = Instance.new("IntValue",stats)
	credits.Name = "Credits"
	
	local key = "Player-"..player.UserId
	local PDS = DataStore:GetAsync(key)
		if PDS ~= nil then
			credits.Value = PDS 
		else
			DataStore:SetAsync(key, credits.Value)
		end
	credits.Changed:connect(function()
	    local key = 'Player-'..player.UserId
	    DataStore:SetAsync(key,credits.Value)
	    end)
	repeat wait() until player:WaitForChild("DataFolderStore")
	player.DataFolderStore.Changed:connect(function() -- This is where it doesn't work
		local key = 'Player-'..player.UserId
		DataStore:SetAsync(key,player.DataFolderStore:GetChildren())
	end)
end)

Script to insert the folder:

game.Players.PlayerAdded:connect(function(player)
	local folder = Instance.new("Folder",player)
	folder.Name = "DataFolderStore"
end)

Please help!