Calculation of employee salaries

Web developer services are required. It is necessary to develop a system for calculating the salary of an employee of the car service. It is necessary to authenticate users, take into account personal data of employees, record and adjust the actual time worked by employees, calculate staff wages using various pay systems, time and piecework, assess the performance indicators of the organization and a particular employee when calculating wages.

There is a mysql database and the primary page of the site, you need to connect through the php apache you know better, and add the above written.
Add authorization to the database and together