Please wait till July 1 when GST will be implemented. As of now, only existing taxpayers are being migrated into the new GST system.
Fresh registrations will start when the GST regime kicks in.
In any case, if you wish to raise invoices that total an amount upto 9 lacs in a financial year, you can do so without any service tax liability as per the existing Service Tax law. Beyond 9 lacs, you will have to apply for Service Tax registration. This is subject to condition that your billing for the last financial year was less than Rs.10 lacs.
For any further help or advise, please feel free to connect with us. We deal in matters related to GST as well as Service Tax.
Thanks & Regards,
Avika