[DarkRP]How can i update a darkrpvar on button click?

[jolo309]

Hello, i'm making a simple clan system for darkrp, and i'm new to making gmod addons, modules, etc...
But i'm pretty sure i can make a simple clan system, i just need to understand some stuff :)

I've made a tab called "Clan" and in there i have a input field, and a button. When i click
the button i want to make the clan, but how do i update the value that's in the setDarkRPVar("clan") when i click the button serverside? And then save the clan so it's still there when they rejoin or the server is restarted?

If this is too much to ask for, i'm sorry.

Another thing i'm not sure about is how i should organize things, like when to use server, when to use shared, and then the client?

cl_clanhud.lua:

local tabName = "Clan"
local ply = LocalPlayer();
local clanName = "None";

local function IsInClan()
	if(IsValid(ply)) then
		if(ply:getDarkRPVar("clan") == "None") then
			return false;
		else
			return true;
		end
	end
end

function CreateClan()
	-- hook.Call( "ClanCreate", GAMEMODE, ply );
end

local function clanTab()
	-- DarkRP.switchTabOrder(2, 3) -- Remove the "--" in this line if you want to move the third tab to the left of the second tab!
	local panel = vgui.Create("DPanel");
	
	if(!IsInClan()) then
		local clanNameLbl = vgui.Create("DLabel", panel);
			clanNameLbl:SetText("Clan Name: ");
			clanNameLbl:SetSize(100, 20);
		
		local clanNameTb = vgui.Create("DTextEntry", panel);
			clanNameTb:SetSize(150, 20);
			clanNameTb:SetPos(100, 0);
			clanNameTb:SetText("Clan name...");
			clanNameTb:SetTextColor(Color(255, 255, 255, 255));
			clanNameTb.OnEnter = function( self )
				clanName = self:GetValue();
			end
			
		local createClanBtn = vgui.Create("DButton", panel);
			createClanBtn:SetSize(100, 20);
			createClanBtn:SetPos(50, 30);
			createClanBtn:SetText("Create Clan");
			createClanBtn.DoClick = function()
				CreateClan();
			end
	else
		local clanNameLbl = vgui.Create("DLabel", panel);
			clanNameLbl:SetText("Clan Level: " .. LocalPlayer():Health());
			clanNameLbl:SetSize(200, 20);
	end
	
	DarkRP.addF4MenuTab(tabName, panel);
end
hook.Add("F4MenuTabs", "ClanTab", clanTab);

The code is not great, but i've got no clue how else to do it. You can see i have no clue, like i use hook.Call but i'm not doing it right, because i think i'm misunderstanding alot of things

sh_clansystem.lua:

if(SERVER) then
	local function spawn( ply )
		if(ply:getDarkRPVar("clan") != nil) then
			ply:setDarkRPVar("clan", ply:getDarkRPVar("clan"));
		else
			ply:setDarkRPVar("clan", "None");
		end
		
	end
	hook.Add("PlayerSpawn", "playerSpawn",  spawn);
end

if(CLIENT) then


end

Lots of things is out of place, i would really appreciate if anyone can help me, understanding these things, and how to get started. Because i really want to make my own mods to a DarkRP server i'm making with a friend.

Again, i would appreciate it alot if any one can help :-)