simple level system, i can make they block weapon for certain level?

[hwplays]

the simple level system only show level...xp.. and anymore
i can make they block sandbox weapons type RPG,AR2.. Crossbow to certain level ?
[url]http://steamcommunity.com/sharedfiles/filedetails/?id=856490057[/url]

type player try get a weapon and print msg "you need be level 40 to unlock"

and i want make appear in scoreboard(i use sui scoreboard)
type [url]http://imgur.com/a/QaO5x[/url]

i need help, i don't know much about lua, only the basic,
I'm working night and day so my server is the best in Brazil,
And it is thanks to you that help me here that I am getting.
:)
IF be need i can past the addon here

cl_init.lua

surface.CreateFont( "FontBig", {
	font = "Bebas Neue",
	size = 30,
	weight = 0,
	antialias = true
} )

surface.CreateFont( "FontNormal", {
	font = "Bebas Neue",
	size = 24,
	weight = 0,
	antialias = true
} )

local function HUD()
	local level = LocalPlayer():GetLevel() or 1
	local exp = LocalPlayer():GetExp() or 0
	local prestige = LocalPlayer():GetPrestige() or 0
	local maxexp = Exp.Levels[level].ReqExp and Exp.Levels[level].ReqExp or 0

	local percentage = (exp/maxexp)*100
	local length = (Hud_Bar.BgLength)/100*percentage

	draw.RoundedBox( 0, Hud_Bar.BgPosW, Hud_Bar.BgPosH, Hud_Bar.BgLength, Hud_Bar.BgHeight, Hud_Bar.BgColor )
	draw.SimpleText( "c", "marlett", Hud_Bar.BgPosW, Hud_Bar.BgPosH, color_white )
	draw.SimpleText( "f", "marlett", Hud_Bar.BgPosW + Hud_Bar.BgLength - 13, Hud_Bar.BgPosH + 17, color_white )

	if length < 5 then
		draw.RoundedBox( 0, Hud_Bar.FgPosW, Hud_Bar.FgPosH, length + 5, Hud_Bar.FgHeight, Hud_Bar.FgColor )
		draw.RoundedBox( 0, Hud_Bar.FgPosW, Hud_Bar.FgPosH, length + 5, Hud_Bar.FgHeight - 15, Hud_Bar.FgColor )
	else
		draw.RoundedBox( 0, Hud_Bar.FgPosW, Hud_Bar.FgPosH, length - 7, Hud_Bar.FgHeight, Hud_Bar.FgColor )
		draw.RoundedBox( 0, Hud_Bar.FgPosW, Hud_Bar.FgPosH, length - 7, Hud_Bar.FgHeight - 15, Hud_Bar.FgColor )
	end

	if prestige > 0 then
		draw.SimpleText( "Level: " .. level .. " (" .. prestige .. ")", "FontNormal", Hud_Bar.TextLvlPosW, Hud_Bar.TextLvlPosH, Hud_Bar.TextLvlColor, Hud_Bar.TextLvlAlign, Hud_Bar.TextLvlAlign )
	else
		draw.SimpleText( "Level: " .. level, "FontNormal", Hud_Bar.TextLvlPosW, Hud_Bar.TextLvlPosH, Hud_Bar.TextLvlColor, Hud_Bar.TextLvlAlign, Hud_Bar.TextLvlAlign )
	end

	draw.SimpleText( exp .. "/" .. maxexp, "FontBig", Hud_Bar.TextExpPosW, Hud_Bar.TextExpPosH, Hud_Bar.TextExpColor, Hud_Bar.TextExpAlign, Hud_Bar.TextExpAlign )
end
hook.Add( 'HUDPaint', 'HUD', HUD )

sv_init.lua

util.AddNetworkString( "ExpMsg" )
util.AddNetworkString( "ExpNotify" )

local function Init()
	local file, dir = file.Find( "perks/*.lua", "LUA" )
	for _, files in pairs( file ) do
		include( "perks/" .. files )
	end

	local query = "CREATE TABLE IF NOT EXISTS experience ( steamid varchar(20), prestige int, level int, exp int )"
	local result = sql.Query( query )
end
hook.Add( 'Initialize', 'Init', Init )

local function Check( ply )
	CheckPlayer( ply )
	if Exp.Config.UseTimer then
		timer.Create( "GiveExp_" .. ply:UniqueID(), Exp.Config.ExpInterval * 60, 0, function()
			ply:GiveExp( Exp.Config.ExpPerMinutes )
		end )
	end
end
hook.Add( 'PlayerInitialSpawn', 'FirstSpawn', Check )

local function SaveOnDisc( ply )
	if timer.Exists( "GiveExp_" .. ply:UniqueID() ) then timer.Destroy( "GiveExp_" .. ply:UniqueID() ) end
	ply:Save()
	MsgN( "[Experience] Saved " .. ply:Nick() )
end
hook.Add( 'PlayerDisconnected', 'SavePlayer', SaveOnDisc )

local function OnKill( victim, weapon, killer )
	local exp = 0
	if #player.GetAll() < Exp.Config.MinPlayers then return end
	if not Exp.Config.ExpOnKills then return end

	if killer:IsPlayer() and victim:IsPlayer() and killer ~= victim then
		if Exp.Config.Gamemode == 1 then
			if GetRoundState() == ROUND_POST then return end
			if killer:IsRole( ROLE_TRAITOR ) and victim:IsRole( ROLE_INNOCENT ) then
				exp = Exp.Config.InnoKillExp
			elseif killer:IsRole( ROLE_TRAITOR ) and victim:IsRole( ROLE_DETECTIVE ) then
				exp = Exp.Config.DeteKillExp
			elseif killer:IsRole( ROLE_INNOCENT ) and victim:IsRole( ROLE_TRAITOR ) then
				exp = Exp.Config.TraitorKillExp
			elseif killer:IsRole( ROLE_DETECTIVE ) and victim:IsRole( ROLE_TRAITOR ) then
				exp = Exp.Config.TraitorKillExp
			end

			if exp > 0 then
				killer:GiveExp( exp )
			end
		else
			killer:GiveExp( Exp.Config.Exp )
		end
	end
end
hook.Add( 'PlayerDeath', 'GiveExp', OnKill )

have more files [url]http://imgur.com/a/4ZMC0[/url]
[url]http://imgur.com/a/0fH8x[/url]