The things people can learn about just by reading this section every now and then! Never generated my own wallets but I always thought this paper wallets are not recommended anymore? Or is Bitcoin wiki wrong now?
Flip a coin 11 times, turn the resulting number in to a BIP39 word from the word list. Repeat 22 more times.
Flip a coin 3 times, calculate the checksum using a permanently airgapped computer, pick the last word.
How do you mean turn resulting number? Coinflip is Heads or Tails only right?