How do I reference the player from a server script?

So this script works when I test on the client, but not in a server. I know it's because I'm trying to reference the player, but I'm not sure how I should be doing it from a server script.

function teleport()
    local target 
    for i, player in ipairs(game.Players:GetChildren()) do
        if player.Playing.Value == 0 then
            local char = player.Character or player.CharacterAdded:Wait()
            if char.Humanoid.Health ~= 0 and char:FindFirstChild("Choice") then -- "Choice" from vehicle select gui local script
                print("Choice")
                -- ADD CARS HERE. Probably a more efficient way to do this
                if char.Choice.Value == "Car1" then
                    local Car1 = game.ServerStorage.Car1:Clone()
                    Car1.Parent = game.Workspace
                    target = Car1.PrimaryPart.CFrame
                    char.HumanoidRootPart.CFrame = target
                    player.Playing.Value = 1
                end
            else if char.Choice.Value == "Car2" then
                -- etc
                end
            end
        end
    end
end