How can I use Collection Service to control all my NPC's movement with one script?

So my game needs around 30 - 60 NPC's that just walk around randomly. So this is the script that makes the NPC walk randomly. But I want to control multiple NPC's with just 1 script. So I need help to use collection service.

local myHuman = script.Parent:WaitForChild("Humanoid")
local myRoot = script.Parent:WaitForChild("HumanoidRootPart")
local Torso = script.Parent:WaitForChild("Torso")

function walkRandomly()
	local xRand = math.random(-75,100)
	local zRand = math.random(-75,100)
	local goal = myRoot.Position + Vector3.new(xRand,0,zRand)
	
	local path = game:GetService("PathfindingService"):CreatePath()
	path:ComputeAsync(myRoot.Position, goal)
	local waypoints = path:GetWaypoints()
	
	if path.Status == Enum.PathStatus.Success then
		for _, waypoint in ipairs(waypoints) do
			if waypoint.Action == Enum.PathWaypointAction.Jump then
				myHuman.Jump = true
			end
			myHuman:MoveTo(waypoint.Position)
			local timeOut = myHuman.MoveToFinished:Wait(1)
			if not timeOut then
				-- got stuck
				myHuman.Jump = true
				walkRandomly()
			end
		end
	else
		--path failed
		wait(1)
		walkRandomly()
	end
end


Torso.Touched:Connect(function(obj)
	if not obj.Parent:FindFirstChild("Humanoid") and math.random(1,24) == 24 then
		myHuman.Jump = true
	end
end)

function main()
	
		myHuman.WalkSpeed = 16
		walkRandomly()
end

while wait(0.1) do
	if myHuman.Health < 1 then
		break
	end
	main()
end