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Why didn't you just use your old Apple ID on the new device? The account is not tied to any device in particular.

You don't "get" a password, you assign one yourself. If it is now not working then likely you forgot the one you assigned. This Apple article has instructions for what to do if you have forgotten your Apple account password —> If you forgot your Apple ID password - Apple Support

or go directly to this link —> http://iforgot.apple.com/

If you didn't receive your verification or reset email, read this Apple Support article: If you didn't receive your verification or reset email - Apple Support

"When you make certain updates to your Apple ID, we’ll send you an email to help you complete the update. For example, you might have reset your password, reset your security questions, or added a new email address to your account."

If you find you can’t sign in, reset your password, or receive verification codes, you can request account recovery (read this support article: How to use account recovery when you can’t reset your Apple ID password - Apple Support ) to regain access to your account. Account recovery might take a few days or longer, depending on the specific account information you can provide to verify your identity.

If you still need help:

Contact Apple for help with Apple ID account security "This article provides country-specific Apple Support contact information for customers seeking help with their Apple ID password or other security-related issues." —> Contact Apple for help with Apple ID account security - Apple Support

If you are signed into this forum using the same Apple Account then your browser may be configured to automatically enter your password. You should be able to view stored passwords in your browser's preferences/settings.

If this device came with an account on it, take it back to the person who sold it to you and ask them to do the things in this support article.

What to do before you sell, give away, or trade in your iPhone or iPad - Apple Support