For many services, you will have to bind them to an app in order to get the VCAP_SERVICES credentials.
There is a service key capability which some services are starting to adopt which allows you to create and access credentials without binding to an app. Using the cf
command line tool, the commands below are available to use if a service supports them:
SERVICES:
create-service-key, csk Create key for a service instance
service-keys, sk List keys for a service instance
service-key Show service key info
delete-service-key, dsk Delete a service key
The CloudFoundry docs at https://docs.cloudfoundry.org/devguide/services/service-keys.html provide more detail.
In the Bluemix UI, you would see a 'Service Credentials' option in the panel when viewing a service dashboard when a service supports this capability. Selecting this option allows you to see credentials that have been created as well as an "Add Credentials" button to create new ones.