Help Setting Up Process Activities

Hi, 

I'm looking for some guidance on setting up a process.

I want the process to run once per week, reading all Activities where the start date is <= Yesterday and the field (Result) is not filled in. 

Then I want the process to send 1 E-mail to the organiser listing the records that need the results field completing. 

I'm  relatively new to processes and sub processes so any guidance would be really appreciated.