Hello Kavitha,
Welcome to the Forum. Since you are going to start your carrier in HR field, I assure you will get valued suggestions from experienced members on various related topics.
The functions of HR are very vast and changes time to time in accordance with structure, size, ethics, strategy of the company and ruling law of the govts. Rightly suggested by Mr. Dinesh "first understand the culture of the company and then take a call on what policies are required" and have an audit over the issue.
However, pls find below some common policies and procedures followed in general.
These are the common topics, for implementation you can elaborate them in detail in consultation with your management or consultant.