Looking at your requirements, you would have to make use of Managed Default Folders (tab) and then right click "Inbox" select "new maanged content settings" specify a name and go through the settings that suits your requirements ; same apply for deleted items folder too
To create the bucket folder for holding emails older then 8 months, you would have to create the folder using the "Managed Custom Folders"
organization configuration > Mailbox >
Let me know if you have any questions