Flow - Trigger mail on SharePoint Library Column

Hi All

I'm busy building a simple Contract Management System in sharepoint where i store all my supplier contracts in one place and now im trying to trigger a mail notification based on the notice period to send me a mail\team notification that the contract is about to expire.

I created a Library in SharPoint and added a few custom columns to the library to specify a few things namely :

• Contract Name
• Start Date
• End Date
• Notice Period
• Contract Owner

Now my question is how do I do the flow part that will send the notifications ?

Please guide me what to use in flow to get the desired result here.

Many Thanks 
Janus