This article outlines the only way to reset your password:
https://support.apple.com/en-us/HT201487
Summary of the key points:
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If you have a device that’s still signed into your Apple ID, you can reset the password from that device’s settings. You go to the Settings / System Preferences app and open your Apple ID > Password & Security page. There, you can Change Password.
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If you do not, you must use https://iforgot.apple.com.
This article outlines how security questions work:
https://support.apple.com/en-us/HT201363
Summary of the key points:
- You no longer have security questions if you enabled two-factor authentication. You must use the account recovery flow at https://iforgot.apple.com (more on that below).
Lastly, as I mentioned, if you have enabled two-factor authentication you will not have security questions. Thus, you must follow the flow at https://iforgot.apple.com. Information on that process is here:
https://support.apple.com/en-us/HT204921
Account recovery is done by email, phone, and sometimes by credit card. Follow the prompts given and you may be able to recover your account.