1. Do not deposit anything, before your account is not fully verified. Because any bookie will accept your bet without verifying your account, but if you win and request a withdrawal, they will refuse and ask you for verification. You might not pass it for a lot of reasons, like bettors from your country are not allowed to use that bookie, or the documents provided by you are not acceptable e.t.c...
I highly agree to this,
Most of the common mistakes by newbies nowadays is that, they don't give any of their time to verify first their account to know if their country is eligible or prohibited to use the website. So, their winnings is most likely be put to waste since they cannot receive their winnings in the end.
specially if you win Big like Jackpot,they will make issues about your account to deny payments and there are some issues like this before so right make sure your account is verified first before putting good amount of money inside their site.
but in totality all of the Points from Op is valid and must be followed if we wanted to have a safer gambling activities here in online betting.