I'm sorry to hear you are not having the easiest time getting starting with the Cloud Platform. From the sounds of it, your facing some errors when trying to add a valid billing account. As this is primarily a discussion forum for architecture and best practices on App Engine, we don't really deal with billing issues. I can however, recommend that you check out our
Billing and Payments Support page, and submit a billing support request using
this form. The billing team will be able to help you with this issue.
Once you get your billing account up and running, I'd suggest taking a look at our
Quickstart for Node.js to deploy a Hello World. Then, feel free to ask the community here or on
Stack Overflow questions specific to App Engine. We'll be happy to help to the best of our ability.