Dear Sundu,
As others have said, you have to approach the office of the Labour Commissioner, Dy. Labour Commissioner, or Labour Officer, depending on the area in which your shop or establishment is located. According to the Shop and Commercial Establishment Act, for registration under the same, you have to provide information related to the employer (name, age, address, status, etc.), and employees (name, father's name, date of joining, shift working hours, days of rest, etc.) on forms A, B, and F. You are also required to pay some registration fees as per the state government's Labour Department notification.
When you are registered with the shop and commercial establishment, you are bound to comply with all the statutory provisions applicable to shops or commercial establishments. Purchase the forms, complete them, and submit them to the concerned authority. A shop inspector may visit for verification of the site and information provided by you.
Regards,
Anil Anand