As you asking for the functions of the Human resource Manager let me tell you that the human resource management activities of an organization to maximize the strategic use of human resources and maintain functions such as employee compensation, recruitment, personnel policies, and regulatory compliance.

the Five basic functions of a HR Manager are as follow :

Recruitment. ...
Training. ...
Professional Development. ...
Benefits and Compensation. ...
Ensuring Legal Compliance.

As you wants to become an HRZ manager as a First step you may have a MBA in Human resource and Management here I am providing you the details of the MBA in Human resource and Management that are as follow :

the MBA in Human Resource and Management Course is designed to provide the business expertise essential for senior managers by combining specific engineering subjects with managing technology and manufacturing systems.

Eligibility criteria:

A candidate who has passed Bachelor’s Degree or Master’s Degree from any recognized University with minimum 45% marks in aggregate (40 % in case of SC / ST candidate)or any other equivalent qualification.

MBA Entrance test:
CAT
MAT
XAT
IBSAT

Some good colleges for MBA in Human Resource Management are as follow :
University 18
Indo Asian Academy Management Studies
Indian Institute of Technology - IIT Kanpur