How to create a back ground job in SM36?

Hi Experts,

My requirement is that on first day of business, report should execute and extract data for first day of previous month till  the date of execution of report.

For e.g.

For period 5, report should have executed on 05/27/2015 extracting data from 05/01/2015 till 05/26/2015.

For period 6, report should execute on 06/26/2015 extracting data (delta) from 05/27/2015 till 06/25/2015.

Please describe with detailed steps to create job in SM36.

Thanks,

Ganesh