Need password to enter into new iPhone?

Need password to enter into new iPhone? - 1

No, but thank you for asking.

Apple ID?

With a brand new phone, you create your own account ID and password.

If it already has an "Apple ID" set then you need to get that from the previous owner; only they can unlock the phone from their account.

If the previous owner does not have the ID / password, it is most likely a stolen phone.
Go to the Police - you can be arrested for handling stolen property if you do anything else.

If it is ID locked (icloud locked) there's no way around it, it's the basic anti-theft system to make stolen phones worthless.