Except for the listed exceptions, the token copies exactly what was printed on the original card and nothing else. It doesn’t copy any information about the object the card was before it was put into your graveyard.

If the card copied by the token had any “when [this permanent] enters” abilities, then the token also has those abilities and they’ll trigger when it enters. Similarly, any “as [this permanent] enters” or “[this permanent] enters with” abilities that the token has copied will also work.

The token is a Zombie in addition to its other types and is white instead of its other colors. It has no mana cost, and thus its mana value is 0. These are copiable values of the token that other effects may copy.

Once you’ve activated an embalm ability, the card is immediately exiled. Opponents can’t try to stop the ability by exiling the card.