How Do I Make A Random Spawn Generator With My Current Code?

I am having trouble figuring out how to make a random generating spawn to spawn the drooling zombies at and here is my current code

wait(60) -- Wait 1 minute

local enemy = game.ServerStorage["Drooling Zombie"]
local spawn = game.Workspace.Spawn

while true do
    local c = enemy:Clone() -- Clone the enemy model.
    c.Parent = game.Workspace -- Parent it to the Workspace.
    c:MoveTo(spawn.Position) -- Move the enemy to the center of Spawn's position.
end

Can someone help me?