I've tried to search on several boards about tutorials on how to make a BlueWallet wallet, but I couldn't find it.
The only topic I know is from 2019:
A great lesser known wallet! [BlueWallet].
I like BlueWallet for small (because it's custodial) LN payments, but there's a
but: a while ago, they changed the backup format for LN wallets, and after that change, it didn't recognize the old format anymore without editing it. I talked to them on Telegram, but they didn't seem to care.