Why does this script not work?

Its Supposed to be for a Murder Mystery Type game, Except made from Screen Guis on Invisible parts, It is not working for some reason though, No errors, Just doesnt work, Any reason why?

Script

Names = {"Sarah","Paul","Michael","Heather","Kevin","India"}
Colors = {"Really red","Really blue","Really black","Earth green","Cyan","Pink"}
 
for i,v in pairs(game.Players:GetChildren()) do
    b = Instance.new("Part", v.Character.Head)
    g = Instance.new("SurfaceGui", v.Character.Head.b)
    t = Instance.new("TextLabel", v.Character.Head.b.g)
b.Size = Vector3.new(3.8, 2.6, 0.8)
b.Position = Vector3.new(44.4, 7.54, -43.25)
b.CanCollide = false
b.Transparency = 1
t.BackgroundTransparency = 1
t.Size = Vector3.new{"0,800"},{"0,600"}
t.Font = "Legacy"
t.FontSize = "Size48"
t.Color = Colors[math.random(#Colors)]
t.Text = Names[math.random(#Names)]
if v.Character.Humanoid.Health == 0 then
v.Character.Head.b.g.t.Text = Names[math.random(#Names)]
end

You forgot an end! Edit : (Multiple errors)

Try this ;

names = {"Sarah","Paul","Michael","Heather","Kevin","India"}


for i,v in pairs(game.Players:GetChildren()) do
if workspace:FindFirstChild(v.Name) then
c = BrickColor.Random()
local b = Instance.new("BillboardGui",v.Character.Head)
b.Size = UDim2.new(6,0,2,0) 
b.StudsOffset = Vector3.new(0,1.5,0)
local text = Instance.new("TextLabel",b) 
text.Size = UDim2.new(1,0,1,0) 
text.Text = names[math.random(1,#names)] 
text.TextColor3 = c.Color 
text.TextScaled = true text.BackgroundTransparency = 1
end
end