about registration

W.e f. 1 July 2017, GST has replaced Service Tax.

So if your Sweet shop turnover during a financial year exceeds Rs 20 lakhs then registration must be obtained. 

Composition scheme option is available for small dealers/ traders who have annual grregate turn over below Rs 75 Lakhs.

With regard to labour payment please clarify whether the labou are employed in your shop on monthly/ weekly fixed pay ( Salary) or they are hired on contract ( Contract labour) for specific job basis.

Services by an employee to the employer in the course of or in relation to his employment is not liable to GST - no payment of GST

But in case of job basis labour, you will be liable to pay GST on reverse charge basis in case they are unregistered.