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

The token’s power and toughness are 1/1. These are copiable values of the token that other effects may copy. If the copied card has an ability that defines its power or toughness, that ability isn’t copied. On the other hand, gaining haste after the token has been created is not a copiable value.

The token copies exactly what was printed on the original card and nothing else, except the characteristics it specifically modifies. It doesn’t copy any information about the object the card was before it was put into your graveyard.