I think your best course of action is to start off setting up a WebEx sandbox and familiarizing your self with the products, without any experience actually using WebEx directly your going to struggle to understand and use the API's for it.
The URL API is a legacy WebEx API and functionality is very limited compared to the XML API, We urge developers to focus on the WebEx XML API as its capabilities are far more robust.. I would suggest you focus your efforts on the XML API and disregard the WebEx URL API.
The documentation for the API's is all on Cisco DevNet, the vast majority of it is textual documentation.. We do not have any visual media avilable for API Integration.
Best Regards,
-Ryan