How do I view what I am being billed for?

The first page that is displayed when you log in to your billing account will show you what invoices, if any, are due, and it will also show you all the active and billable packages there are under your account - along with a description, the billing cycle, and when it is due for renewal.  You can return to this page at any point by clicking on Overview under Dashboard.

On top of that, if you click on Packages (conveniently under Packages) you can see all of the packages in your account, including any that have previously been cancelled.  This will also show you all the information above (renewal dates, billling cycles etc).