"create me a roblox data player template and say to me where to put it"

Sure, here's a basic template for a player data system using Roblox's DataStore service. This script should be placed in ServerScriptService.

```lua
local DataStoreService = game:GetService("DataStoreService")
local PlayerDataStore = DataStoreService:GetDataStore("PlayerData")

game.Players.PlayerAdded:Connect(function(player)
	local playerUserId = "Player_" .. player.UserId
	local playerData
	local success, err = pcall(function()
		playerData = PlayerDataStore:GetAsync(playerUserId)
	end)
	
	if success then
		if playerData then
			-- Load data
			player.leaderstats.Cash.Value = playerData.Cash
			player.leaderstats.Level.Value = playerData.Level
		else
			-- No data found, setting default values
			player.leaderstats.Cash.Value = 0
			player.leaderstats.Level.Value = 1
		end
	else
		warn("Failed to get data for player " .. player.Name .. " due to " .. err)
	end
end)

game.Players.PlayerRemoving:Connect(function(player)
	local playerUserId = "Player_" .. player.UserId
	local playerData = {
		Cash = player.leaderstats.Cash.Value,
		Level = player.leaderstats.Level.Value
	}
	
	local success, err = pcall(function()
		PlayerDataStore:SetAsync(playerUserId, playerData)
	end)
	
	if not success then
		warn("Failed to save data for player " .. player.Name .. " due to " .. err)
	end
end)
```

This script will save two stats, Cash and Level, for each player. You can add more stats as needed. The data is saved when the player leaves and loaded when they join. Make sure to replace "YourDataStore" with the name of your data store.

If you want to add more stats, you can add them under the playerData table and set their default values under the else statement in the PlayerAdded event.

Note: You will need to create the leaderstats and the Cash and Level IntValue for each player. This is usually done in a separate script in ServerScriptService.

Also, remember to enable API services in your game settings to use DataStore.