If the creature isn't destroyed (perhaps because it has indestructible), its controller doesn't create any tokens. The same is true if the creature is destroyed but instead of going to its owner's graveyard, a replacement effect moves it elsewhere, such as exile.

Use the power and toughness of the creature from when it was last on the battlefield to determine the power and toughness of the tokens.

Except for power and toughness, the token copies exactly what was printed on the original creature and nothing else (unless that creature was copying something else or it's a token; see below). It doesn't copy whether that creature was tapped or untapped, whether it had any counters on it or Auras and Equipment attached to it, and so on.

If the original creature had a characteristic-defining ability that determined its power and/or toughness, that ability is not copied.

If the copied creature had {X} in its mana cost, X is considered to be 0.

If the chosen creature was a token, the new tokens copy the original characteristics of that token as stated by the effect that created the token, plus the listed exceptions.

If the copied creature was copying something else, then the tokens enter the battlefield as whatever that creature copied, with the exceptions noted above.

Any enters-the-battlefield abilities of the copied creature will trigger when the tokens enter the battlefield. Any "as [this creature] enters the battlefield" or "[this creature] enters the battlefield with" abilities of the chosen creature will also work.