How to send automatically invoice reminder

Dear all,

I have trouble to setup an automatic invoice status reminder to my customer accounting.
What I am trying to reach is the following :

We have issue and invoice to a customer with for instance an Issue date of 10 january and a Due date of 20 january .
Then I would like to be able to send Reminder 1 an automatic email when the Current date is Due Date - 5 days
Then I would like to be able to send Reminder 2 an automatic email when the Current date is Due Date

Then I would like to be able to send Last Reminder an automatic email when the Current date is passed Due Date

I am fighting on setting up this worflow. I try to get a single workflow which will be smart enought to validate each condition and push the proper email template

Could you please help, could not reach it

thanks for help

regards

serge