Issues while fetching the data from the CDC schema tables! !

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SQL-Server-2012

Hi All
I tried to create a CDC enabled Database and performed few DML operations onto it. However upon executing the select * from tables like:-

[cdc].[captured_columns],[cdc].[ddl_history],[cdc].[index_columns],[cdc].[change_tables]

I am not getting any data capture across the columns,no data is being retrieved in the above columns:(

What I have tried:

I tried creating the CDC using the following syntax:-

Exec sys.sp_cdc_enable_db
Exec sys.sp_cdc_enable_table
@source_schema='dbo'
@source_name='CustDetails'
@role_name='Null'
@support_net_changes=1

(But I do have to admit that, i don't remember whether I entered the last line or not!!how do i ensure this??)
Please help me to resolve the problems here!!