How could I check to see if an item is in the items folder?

Ok, so i'm making an inventory system(need help), and I'm trying to do it by myself even though I've never doen it before. How would I check to see if there is more than one of the item that is collect or if there is none that way I could control the amount and the item in the inventory

--Place this in a localscript
--The localscript has to be in StarterPlayers.PlayerScripts(NOT CHARACTER SCRIPTS)
--In the tool use a "IntValue" in the tool and set it to 1 in properties
--Rename the IntValue to "ToolCount"
while wait() do
	local tools = game.Players.LocalPlayer.BackPack:GetChildren()
	for _,count in ipairs(tools) do
		local numbers = count.ToolCount.Value
		print(1 < numbers)
		print(numbers)
--[[This is the code i came up with because i cant really understand what you going to use it for, so i just made a script that gets the children and takes the value inside them, and prints true if its more than 1 in the players backpack, and it also prints how many it is
--Tell me if it does not work and i will check it
]]
	end
end