How do I make a NPC Follow you with a Custom Walking Animation?

Follow Code:

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 = 50
	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

How do I alter this script to make the NPC chase you with a custom animation? So far it just chases you with NO animation.

--EDIT-- Animation Code

wait()
state = {Enum.HumanoidStateType.Running,
		Enum.HumanoidStateType.RunningNoPhysics,
		Enum.HumanoidStateType.Jumping,
		Enum.HumanoidStateType.Freefall,
		Enum.HumanoidStateType.Landed
}

-----------EDIT THIS PART--------------

animations = {"2718926162", -- Running/Walking
			"", -- Idle
			"", -- Moving Jump
			"", -- Idle Jump
			"", -- Freefalling
			"" -- Landing
 }

---------------------------------------
--Model
CurrentState = ""
Animation = ""
canPlay = true

Player = game.Players.LocalPlayer

function playAnimation(Source,animation,player)
	if canPlay then
		local player = script.Parent.Parent
		canPlay = false
		local animTrack = Source.Humanoid:LoadAnimation(animation) -- Load animation into Humanoid
		canPlay = true
		animTrack:Play() -- Start the animation
	end
end

local animation = Instance.new("Animation")
	
local character = Player.Character
local humanoid = character.Humanoid

humanoid.StateChanged:connect(function(old,new)
	if CurrentState == "Running" and new == state[3] then -- Moving to Jump
		CurrentState = "Jump"
		
		if animations[3] ~= "" then
			animation.AnimationId = "http://www.roblox.com/Asset?ID="..animations[3]
			playAnimation(character,animation)
		end
	end
	
	if CurrentState == "Idle" and new == state[3] then -- Idle to Jump
		CurrentState = "Jump"
		
		if animations[4] ~= "" then
			animation.AnimationId = "http://www.roblox.com/Asset?ID="..animations[4]
			playAnimation(character,animation)
		end
	end
	
	if new == state[4] then
		CurrentState = "Falling"
		
		if animations[5] ~= "" then
			animation.AnimationId = "http://www.roblox.com/Asset?ID="..animations[5]
			playAnimation(character,animation)
		end
	end
	
	if new == state[5] then
		CurrentState = "Landed"
		
		if animations[6] ~= "" then
			animation.AnimationId = "http://www.roblox.com/Asset?ID="..animations[6]
			playAnimation(character,animation)
		end
	end
	
end)
	
humanoid.Running:connect(function(state)
	if state > 3 then
		if CurrentState ~= "Running" then
			CurrentState = "Running"
			
			if animation[1] ~= "" then
				animation.AnimationId = "http://www.roblox.com/Asset?ID="..animations[1]
				playAnimation(character,animation)
			end
		end
	else
		if CurrentState ~= "Idle" then
			CurrentState = "Idle"
			
			if animation[2] ~= "" then
				animation.AnimationId = "http://www.roblox.com/Asset?ID="..animations[2]
				playAnimation(character,animation)
			end
		end
	end
end)

I have rewritten the code and have got it all working!