Help in overcoming confusion while combining scripts?

I want to make an npc that will shoot fireballs and follow the player. I want the fireball to be activated once the npc detects player. Can someone pls help me combine these script and tell me about any error that may occur. Im quite new actually Follow script - function findNearestTorso(pos) local list = game.Workspace:children() local torso = nil local dist = 100 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("HumanoidRootPart") 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 --wait(math.random(0,5)/10) while true do wait(0.5) local target = findNearestTorso(script.Parent.HumanoidRootPart.Position) _G.target = findNearestTorso(script.Parent.HumanoidRootPart.Position) if target ~= nil then script.Parent.Humanoid:MoveTo(target.Position, target) end end

Fireball script

while true do wait(0.5) local ball = Instance.new("Part") -- CREATE FIREBALL ball.Parent = script.Parent.HumanoidRootPart -- DEFINE PARENT ball.BrickColor = BrickColor.new("Neon orange") ball.Material = Enum.Material.Neon ball.Anchored = false -- SO IT DOSENT FALL ON GROUND ball.CanCollide = false -- TO MAKE IT SHOOT ball.Shape = Enum.PartType.Ball -- MAKE THE FIRE A BALL ball.Size = Vector3.new(5,5,5) --SIZE ball.CFrame = script.Parent.HumanoidRootPart.CFrame * CFrame.new(0,0,-6) -- SET

local x = script.ParticleEmitter:Clone()

x.Parent = ball -- ADD FIRE EFFECT local bodyv = Instance.new("BodyVelocity") -- SETTING UP SPEED bodyv.Parent = ball -- PARENT bodyv.MaxForce = Vector3.new(math.huge,math.huge,math.huge) -- MAXSPEED bodyv.Velocity = script.Parent.HumanoidRootPart.CFrame.LookVector * 150 -- local damage = game.ReplicatedStorage.damage:Clone() damage.Parent = ball -- ADDING DMG

wait(1) ball:destroy() -- TO DESTROY INSTANCES TO REDUCE SERVER LOAD end -- SELF EXPLANATORY