Check this page for details on creating the account, the shipping address, billing address.
http://store.apple.com/us/help/print_products
There is a link at the top: "Get Help", and you can start a chat from there.
If there should be a problem with your Apple ID, causing the error error message account security problem or the AppleID being locked, see this page:
Apple ID: Contacting Apple for help with Apple ID account security
There are either telephone numbers given or an email form:
Explain, that you need help with an account security problem.