Dear Amar,
Sole Proprietary, Partnership Firm, Limited Liability Partnership, Private Limited Company, Public Limited Co., are the terms of nomenclature referring to the constitution of a business entity only.
The application of Labor Laws and the principles of HRM comes into play only when people are hired for employment in any such entity irrespective of its constitution and purpose whether business or otherwise.
Labor Laws can be broadly classified into (1)Establishment-specific laws (2)Industrial Relations laws (3)Laws relating to wages and other heads of payments (4)Social Security laws and (5)Laws relating to Service Conditions
The applicability criterion is linked to the total no of employees employed in the entity in most of the Labor Laws.
Therefore, you have to ascertain what the Labor Laws are applicable to your entity and devise your own HR policy in tune with the provisions of such applicable Laws.