I'm having problems on creating a team rank and points system

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#1

Basically I’m trying to make a team only rank and points system where you need certain team points to rank-up in your team and these ranks and points are unique in each team.

It’s my first time working on this kind of stuff so I’m not really sure what to do, could somebody assist me and tell me what I would have to change and do for this to work?

Here is a video of me trying it in game, of course nothing worked:

Here are my code in both for the player rank and player points/stats:

Rank

game.Players.PlayerAdded:Connect(function(player)
	player.CharacterAdded:Connect(function(char)
	
	local rs = game:GetService("ReplicatedStorage")
	
	local leaderstats = player:WaitForChild("dataFolder")

	local SciCheckValue = leaderstats:WaitForChild("SciencePoints")
	local SciCheckRank = leaderstats:WaitForChild("ScienceRank")
	local SciOverhead = rs:WaitForChild("OverHeads"):WaitForChild("sciOverhead")
	
	if SciCheckValue.Value >= 1 and SciCheckValue.Value < 2 and player.Team.Name == "Science" then

		local ovrh = SciOverhead:Clone()
		ovrh.Parent = char.Head
		ovrh.Frame.plrName = "[S-1]"..player.Name
		ovrh.Frame.plrRank.Text = "Junior Scientist"
		
		SciCheckRank.Value = 1

	elseif SciCheckValue.Value >= 2 and SciCheckValue.Value < 4 and player.Team.Name == "Science" then

		local ovrh = SciOverhead:Clone()
		ovrh.Parent = char.Head
		ovrh.Frame.plrName = "[S-2]"..player.Name
		ovrh.Frame.plrRank.Text = "Scientist"

		SciCheckRank.Value = 2

end

SciCheckValue.Changed:Connect(function()
	if SciCheckValue.Value >= 0 and SciCheckValue.Value < 2 and player.Team.Name == "Science" then

		local ovrh = SciOverhead:Clone()
		ovrh.Parent = char.Head
		ovrh.Frame.plrName = "[S-1]"..player.Name
		ovrh.Frame.plrRank.Text = "Junior Scientist"

		SciCheckRank.Value = 1

	elseif SciCheckValue.Value >= 2 and SciCheckValue.Value < 4 and player.Team.Name == "Science" then

		local ovrh = SciOverhead:Clone()
		ovrh.Parent = char.Head
		ovrh.Frame.plrName = "[S-2]"..player.Name
		ovrh.Frame.plrRank.Text = "Scientist"

		SciCheckRank.Value = 2

	end

		end)
	end)
end)

Points/Data

local DataStore = game:GetService("DataStoreService")

local CashData = DataStore:GetDataStore("cashds-debug123")

local MilPoints = DataStore:GetDataStore("milpds-debug123")
local SciPoints = DataStore:GetDataStore("scipds-debug123")

local MilRank = DataStore:GetDataStore("milrds-debug123")
local SciRank = DataStore:GetDataStore("milrds-debug123")

local Value = 0

game.Players.PlayerAdded:Connect(function(player)
	local DataFolder = Instance.new("Folder")
	DataFolder.Name = ("dataFolder")
	DataFolder.Parent= player

	local cash = Instance.new("IntValue")
	cash.Name = ("Cash")
	cash.Parent = DataFolder
	cash.Value = 1000
	cash.Value = CashData:GetAsync(player.UserId) or Value
	CashData:SetAsync(player.UserId, cash.Value)

	local sci = Instance.new("IntValue")
	sci.Name = ("SciencePoints")
	sci.Parent = DataFolder
	sci.Value = 1
	sci.Value = SciPoints:GetAsync(player.UserId) or Value
	SciPoints:SetAsync(player.UserId, sci.Value)

	local scirank = Instance.new("StringValue")
	scirank.Name = ("ScienceRank")
	scirank.Parent = DataFolder
	scirank.Value = 1
	scirank.Value = SciRank:GetAsync(player.UserId) or Value
	SciRank:SetAsync(player.UserId, scirank.Value)

	--[[local mil = Instance.new("IntValue")
	mil.Name = ("MilitaryPoints")
	mil.Parent = DataFolder
	mil.Value = 0
	mil.Value = MilPoints:GetAsync(player.UserId) or Value
	MilPoints:SetAsync(player.UserId, mil.Value)
	
	local milrank = Instance.new("StringValue")
	milrank.Name = ("MilitaryRank")
	milrank.Parent = DataFolder
	milrank.Value = 0
	milrank.Value = MilRank:GetAsync(player.UserId) or Value
	MilRank:SetAsync(player.UserId, milrank.Value)--]]

	game.Players.PlayerRemoving:Connect(function(player)
		CashData:SetAsync(player.UserId, player.dataFolder.Cash.Value)
		SciPoints:SetAsync(player.UserId, player.dataFolder.SciencePoints.Value)
		SciRank:SetAsync(player.UserId, player.dataFolder.ScienceRank.Value)
		MilPoints:SetAsync(player.UserId, player.dataFolder.MilitaryPoints.Value)
		MilRank:SetAsync(player.UserId, player.dataFolder.MilitaryRank.Value)
	end)

end)

(Note: I’m not really a scripter so I mostly have no idea what I’m doing, I only know basic knowledge in scripting)