Hi
1. Yes you need registered for GST.
Being an exporter you have 2 option :-
Option 1: Supply goods or services, or both, under bond or Letter of Undertaking, subject to such conditions, safeguards and procedure as may be prescribed, without payment of integrated tax, and then claim a refund of unutilised input tax credit.
The exporter needs to file an application for refund on the common portal either directly or through the facilitation ccenternotified by the GST commissioner. An export manifest or report has to be filed under the Customs Act prior to filing an application for refund.
Option 2: Any exporter or United Nations or Embassy or other agencies/bodies as specified in section 55 who supplies goods or services, or both, after fulfilling certain conditions, safeguards and procedures as may be prescribed; and paying the IGST, can claim refund of such tax paid on the supplied goods or services, or both. The applicant has to apply for the refund as per the conditions specified under section 54 of the CGST Act.
2. 10,000 or amount of tax evaded or any short tax liability whichever is higher. Hence, if any person fails to take GST registration and the total tax liability after calculation comes to Rs. 2 lakh, then the penalty for failure to take GST registration shall be 2 lakh or Rs. 10,000 whichever is higher
In case of zero rated services it depends on AO.