We want to use the eDoc API to change values to the template and add templates that way

The API he has seen so far is only for customizing documents -- user instances of a template. We have just recently added an API for editing templates. It is fairly complex in its usage. The endpoint is http://engine.edocbuilder.com/services/templateMgr.svc?WSDL

Preliminary documentation can be found here:
http://support.aleyant.com/kb/a460/edocbuilder-api-to-manage-templates.aspx