Hey Namita,
For building an Event using Microflow, You can follow this learning path,
https://academy.mendix.com/link/paths/42/Building-an-Event-App-Using-Microflows
This learning path is specifically made for what you are searching for,
But as you told that you are new in Mendix and this learning path is of Intermediate level,
I recommend you too first follow the Rapid developer course, so that you can get familiar with how things work,
Hope it helps!