I have to do a notifications section in my project using SharePoint 2013. There is a set of notifications created and assigned to different users. I want to show these notifications (one or many), when the user logs in to the application as a popup message. Also, it should be able to show the message which is triggered automatically on a hourly/daily/weekly basis depending on a custom setting. One or many messages should be there in a single notification message.
I'm new to sharepoint, hence could you please suggest how to do this ?