Hi Yogesh,
Here is a getting started tutorial for SAP and Mendix.
https://www.sap.com/developer/tutorials/mendix-onboarding.html
also here is the link to the Mendix learning modules.
https://gettingstarted.mendixcloud.com/index3.html
When you download the modeler and create a new app, in the SAP tab there are a couple example projects that you can take a look at to get started with.
Hope this helps!