How would I make A Leaderstat of the score and the best score?

wait()

local function get(parent,name) while (not parent:FindFirstChild(name)) do wait() end return parent[name] end;

local plr = game.Players.LocalPlayer
local screen = get(script.Parent,"ScreenGui")
local workspace = get(screen,"Workspace")
local menu = get(workspace,"Menu")
local mouse = plr:GetMouse()

local bird = get(workspace,"Bird")

local paused,jump = false,false
local hit = false
local stats = {
    score = script.Score;
    best = script.Best;
}
local settings = {
}

function bird_physics()
    local grav = 20--14
    local function collision()
        for _,v in pairs(workspace.Obstacles:GetChildren()) do
            local p1x,p1y,p2x,p2y = bird.AbsolutePosition.X,bird.AbsolutePosition.Y,v.AbsolutePosition.X,v.AbsolutePosition.Y
            local s1x,s1y,s2x,s2y = bird.AbsoluteSize.X,bird.AbsoluteSize.Y,v.AbsoluteSize.X,v.AbsoluteSize.Y
            if (((((p1y+s1y) >= p2y) and (p1y <= (p2y+s2y))) and (((p1x >= p2x) or ((p1x+s1x) >= p2x)) and (p1x <= (p2x+s2x)))) or ((bird.Position.Y.Offset > 460) or (bird.Position.Y.Offset < 0)) ) then
                bird:TweenPosition(bird.Position,"Out","Sine",0,true)               
                game_over()
            end
        end
    end
    while wait() do
        if ((not paused) and (not jump) and (bird.Visible)) then
            bird:TweenPosition((bird.Position+UDim2.new(0,0,0,grav)),"Out","Sine",0.1,true)
            collision()
        end
        wait()
    end
end

function bird_jump()
    if (paused) then return end
    jump = true
    bird.Rotation = -50
    bird:TweenPosition((bird.Position+UDim2.new(0,0,0,-90)),"Out","Sine",0.15,true)
    wait(0.25)
    bird.Rotation = -10
    jump = false
end

function generate_obstacles()
    local obj = workspace.Obstacles.Obj:Clone(); workspace.Obstacles.Obj:Remove()
    local logs = {}
    local function same_ob(index)
        local yes = false
        for _,v in pairs(logs) do
            if (v == index) then
                yes = true
            end
        end
        return yes
    end
    delay(1,function() while wait() do
        if (not paused) then
            for _,v in pairs(workspace.Obstacles:GetChildren()) do
                v.Position = (v.Position+UDim2.new(0,-6,0,0)) --4
                if ((v.Position.Y.Scale == 0) and (bird.AbsolutePosition.X > (v.AbsolutePosition.X+v.AbsoluteSize.X)) and (not same_ob(v.Name))) then
                    stats.score.Value = (stats.score.Value+1)
                    table.insert(logs,v.Name)
                end
                if (v.AbsolutePosition.X < 435) then v:Remove() end
            end
        end
        wait()
    end end)
    delay(3,function() while wait() do -- 140 space
        if (not paused) then
            local size1 = math.random(50,360)
            local size2 = ((500-size1)-140)
            local new1,new2 = obj:Clone(),obj:Clone()
            new1.Size,new1.Position = UDim2.new(0,25,0,size1),UDim2.new(1,10,0,0)
            new2.Size,new2.Position = UDim2.new(0,25,0,size2),UDim2.new(1,10,1,-size2)
            new1.Name,new2.Name = math.random(),math.random()
            new1.Parent,new2.Parent = workspace.Obstacles,workspace.Obstacles
            wait(2)
        end
    end end)
end

function game_over()
    hit,paused = true,true
    workspace.GameOver.Score.Text = stats.score.Value
    workspace.GameOver.Visible = true
    workspace.GameOver.Ok.MouseButton1Up:wait()
    bird.Position = UDim2.new(0.5,-20,0,200)
    workspace.GameOver.Visible,menu.Visible = false,true
    workspace.Obstacles:ClearAllChildren()
    stats.score.Value = 0
end

function actions()
    local function update_stats()
        stats.best.Value = (stats.score.Value > stats.best.Value and stats.score.Value or stats.best.Value)
        workspace.Score.Current.Text = stats.score.Value
        workspace.Score.Best.Text = stats.best.Value
    end
    mouse.Button1Down:connect(function()
        bird_jump()
    end)
    menu.Play.MouseButton1Up:connect(function()
        menu.Visible = false
        paused = false
    end)
    menu.Changed:connect(function()
        bird.Visible,workspace.Obstacles.Visible = (not menu.Visible),(not menu.Visible)
        paused = menu.Visible
    end)
    stats.score.Changed:connect(update_stats)
    script.Ready.Value = true
    delay(2,update_stats)
end

while (not plr.Character) do wait() end; plr.Character:Remove()

actions()
generate_obstacles()
bird_physics()

Leaderstats.Score.Value = 0


if (not paused) then
            for _,v in pairs(workspace.Obstacles:GetChildren()) do
                v.Position = (v.Position+UDim2.new(0,-6,0,0)) --4
                if ((v.Position.Y.Scale == 0) and (bird.AbsolutePosition.X > (v.AbsolutePosition.X+v.AbsoluteSize.X)) and (not same_ob(v.Name))) then
                    Leaderstats.Score.value = Leaderstats.Score.Value + 1 
                    table.insert(logs,v.Name)
                end
                if (v.AbsolutePosition.X < 435) then v:Remove() end

            end
end

How would i make this in to a leaderboard of the best and there current score (This is for flappy bird) And the script is in startergui