To create rules for your mailbox in Outlook, go to File, then Rules and Alerts.
In the newly opened window, click on New Rule...
Select the conditions you wish to be met for the outcome to happen, for example if I want to tidy up my mailbox by moving all emails from example@advanceditservices.co.uk into a specified folder, I could create a folder called Advanced IT Services and then set the following conditions:
Apply this rule after the message arrives
From <people or public group> example@advanceditservices.co.uk
move it to the <specified> Advanced IT Services folder
If you have multiple rules you wish to apply, then make sure to untick the <and stop processing more rules> outcome.