If the copied permanent is copying something else, then the token enters as whatever that permanent copied.

If the permanent copied by the token had any "when [this permanent] enters" abilities, the token also has those abilities, and they'll trigger when it's created. Similarly, any "as [this permanent] enters" or "[this permanent] enters with" abilities that the token has copied will also work.

If the copied permanent has {X} in its mana cost, X is 0.

The token copies exactly what was printed on the original permanent (unless that permanent is copying something else or is a token; see below). It doesn't copy whether that permanent is tapped or untapped, whether it has any counters on it or any Auras or Equipment attached to it, or any non-copy effects that have changed its types, color, power and toughness, and so on.

If the copied permanent is a token, the new token that's created copies the original characteristics of that token as stated by the effect that created the token.