How to establish a human resource management system in a small enterprise with 30 people?

It is a waste of resources to establish a human resource management system in a 30-person enterprise. Such a small enterprise only needs one person to be in charge of personnel work full-time or part-time. If the boss insists, it is suggested to subdivide the human resource management system first, and establish several small systems under the human resource management system from the aspects of recruitment, performance appraisal, training, salary, labor management and human resource planning. Because the enterprise is small and changeable, it is suggested that the system should not be too specific, but flexible. Give you a picture to see the general content.