Can someone help me make a following monster?

I am trying to make a following npc, can someone help me? I am a beginner scripter and this is my first time trying to make a following script and cant figure out how plz help :C

There

local list = game.Workspace:children() 
local dist = 500 -- Change to the distance you want the Zombie to find people
local time = 0.1 --Change to how long you want the Zombie to find and chase people (I recommend 0.1)

while true do wait(time)
	for x = 1, #list do
		local temp2 = list[x]
		if (temp2.className == "Model") and (temp2 ~= script.Parent) then
	      local temp = temp2:findFirstChild("Torso")
		   local human = temp2:findFirstChild("Humanoid")
			if (temp ~= nil) and (human ~= nil) and (human.Health > 0) then
				if (temp.Position - script.Parent.Torso.Position).magnitude < dist then
		         script.Parent.--[[Zombies//Change to name of whatever you put this into]]:MoveTo(temp.Position, temp)
				end				--Then remove the text and these: -- [[ ]]
			end
		end
	end
end 

Here try this, make sure it's in a model with a Humanoid, and also make sure the model is not anchored.

local larm = script.Parent:FindFirstChild("Left Arm")
local rarm = script.Parent:FindFirstChild("Right Arm")

function findNearestTorso(pos)
	local list = game.Workspace:children()
	local torso = nil
	local dist = 1000
	local temp = nil
	local human = nil
	local temp2 = nil
	for x = 1, #list do
		temp2 = list[x]
		if (temp2.className == "Model") and (temp2 ~= script.Parent) then
			temp = temp2:findFirstChild("Torso")
			human = temp2:findFirstChild("Humanoid")
			if (temp ~= nil) and (human ~= nil) and (human.Health > 0) then
				if (temp.Position - pos).magnitude < dist then
					torso = temp
					dist = (temp.Position - pos).magnitude
				end
			end
		end
	end
	return torso
end




while true do
	wait(0.1)
	local target = findNearestTorso(script.Parent.Torso.Position)
	if target ~= nil then
		script.Parent.Humanoid:MoveTo(target.Position, target)
	end

end