Hi you know that mysql is no longer a product its now called maria db, fyi,
If you need help running mysql/mariadb please let me know I'd be happy to help you finish your project.
oracle bought mysql, now its mariadb.
I can help you build a DB, and a some simple web pages to show reports based on queries to the db, to do your calculcations etc, maybee a few business layer functions, like showNet or showGross or things like that if necessary,
showMonthlyGross(userID, dateTime), etc.
showGrossPeriodReport(userID, startDate, endDate)