How to make a randomly generated number for a card tool?

How would I make a credit card tool, when you hold it, it opens a UI, then the UI has a randomly generated number as the card number. How do I randomly generate a number per each person and save that number for each game?

My current scripts are as follows:

https://gyazo.com/319be8392102647b53396d7bcb65cfe2 https://gyazo.com/0471345f1094227aca81e991696b552f https://gyazo.com/42ab2650d1132241290206567e1a30fd

LocalScript:

script.Parent.Equipped:Connect(function()
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local createPartEvent = ReplicatedStorage:WaitForChild("RemoteEvent")
 
createPartEvent:FireServer()

local RandomFirstDigit = math.random(1,9)
local RandomSecondDigit = math.random(1,9)
local RandomThirdDigit = math.random(1,9)


end)

Script:

-- Script
 
local ReplicatedStorage = game:GetService("ReplicatedStorage")
local createPartEvent = Instance.new("RemoteEvent", ReplicatedStorage)
 
local function onCreatePartFired(player)
     game.StarterGui.ScreenGui.Frame.Visible = true
end
 
createPartEvent.OnServerEvent:Connect(onCreatePartFired)

You should have three text labels in the screen gui. Number1,Number2 and Number3 then in the local script try this

local number1 = game.StarterGui.ScreenGui.Frame.Number1
local number2 = game.StarterGui.ScreenGui.Frame.Number2
local number3 = game.StarterGui.ScreenGui.Frame.Number3
local ui = number1.Parent.Parent
script.Parent.Equipped:Connect(function()
ui.Enabled = true
local one = math.random(1,9)
local two = math.random(1,9)
local three = math.random(1,9)

number1.Text = one
number2.Text = two
number3.Text = three
end)
script.Parent.Unequipped:Connect(function()
ui.Enabled = false
end)

And that should work. You dont need the normal script or the events or whatever.