Dear Shiba-Swain,
The Labour Licence process in now online in many states. Pls note the certain standard docs which are required (either to upload in online process or to be submitted to the Labour Officer).
1. Agreement (duly mentioning period, price). If it is a sub-contract there should be a clause "the prime contractor can sub-let the job/part of the job" or the contractor can engage sub-contractors etc.....
2. Form V.
3. Employee List with PF-ESI detail.
4. Last month Wages proofs (Attendance, Wages sheet, Bank Transfer Letter etc.).
5. Pay Slips.
6. Appointment Letter.
7. Self Declaration.
8. Authority Letter (if the person, who is supposed to sign docs, is other than the Proprietor, Partner, MD).
In online process may be all above not required, but anyone of the above can be asked during inspection process. Moreover, before applying thru online you have to create an account and Login Id (thru representative's mobile, aadhan, PAN etc.)
You can take any consultant's services, he will help in meeting the incidental exp. as well.