09 May 2013
No need to course, choose your job and working area which related to Indirect taxation. practical experience will give more value than normal course since you already CA
20 June 2013
You have to start your own practice in indirect tax and by trial and error you can become expert. Before that try to study the indirect taxes thoroughly to master the subject and it will help you in your practical life. First you try to understand the basic field like filing of returns, assessments and then the problems solving capacity will automatically be generated.