Should I connect ledger to phantom? (I'm new)

So I already have a phantom account, should I just add ledger to it via the "connect hardware wallet" or should I make a new account using Ledger without Seedphrase?

Also what exactly is "Allow blind sign" since I would need to turn that on to connect it to phantom right?

Edit: all the scammers DMing me don't waste your time I'm not 90 years old