You must choose an existing creature type, such as Vampire or Cat. Card types such as "artifact" can't be chosen.

You can't choose multiple creature types, such as "Cat Warrior." A Cat Warrior is both a Cat and a Warrior. It's affected by anything that affects either type and unaffected by things that affect non-Cat or non-Warrior creatures.

Any “enters” abilities of the copied creature will trigger when the token enters. Any “as [this creature] enters” or “[this creature] enters with” abilities of the copied creature will also work.

You must choose an existing creature type, such as Bird or Wizard. Card types such as artifact can’t be chosen.

Each token copies exactly what was printed on the original creature and nothing else (unless that creature is copying something else; see below). It doesn’t copy whether that creature is tapped or untapped, whether it has any counters on it or Auras and Equipment attached to it, or any non-copy effects that have changed its types, color, or so on.

If the original creature is copying something else, the token enters as whatever that creature copied.