I don't remember the answers to my Apple ID security questions

Hello kingd0m

If you have a rescue email address setup, then you can get that reset through an email as well. If this is not an option then you will need to contact iTunes Store support for further assistance.

Rescue email address and how to reset Apple ID security questions

http://support.apple.com/kb/ht5312

Regards,

-Norm G.

What if I can't answer the previous security questions to change them to a new one? Do I then just reset my account?

You can get the questions reset : If you forgot the answers to your Apple ID security questions - Apple Support