CATS Approval Workflow

Hi Workflow experts,

I am new to workflow, we have some requirement in CATS for approving timesheets,

can somebody pls help me with the below requirements.

an email notifications needs to trigger to the Manager on a particular day of month asking him to approve the timesheets.

and another mail needs to trigger to the employee, on a particular day asking him to enter the timesheet.

and if the Manager rejects the timesheet an email needs to be triggered to employee stating that timesheet has been rejected

points will be awarded for helpful answers

RaD