Hi.
Please take a look at the links bellow. As Anil mentioned, SAP is big, very big and full of paths you can follow.
In order for us to help you, you first need to identify one path.
Advice for Recent College Graduates (aka "Freshers")
My journey from fresh ABAPer to SAP certified FI consultant
Frequently Asked Questions (FAQs) by SAP Consultants
Regards.
Osvaldo Ferreira