How to solve this requirement please give me brief idea

hi Friends give some idea to solve this i am new to this Axapta

1.There is a need to have information about customers which have been invoiced in last one month. Develop a class to export the following customer information to a csv file which had at least one invoicing done in last one month from the day the routine is run. This routine needs to be run periodically.
a. Customer Id
b. Customer name
c. Invoice number
d. Invoice amount
e. Invoice date

This may help:

In this post it looks like you are getting marks in a test/interview. Little point in someone else doing it when you are being tested. [:D]