Dear Nazia,
The best approach would be for you to start with Getting Started with SAP Applications Using SAP Adaptive Server Enterprise which can also be found in Featured Content for SAP Applications on SAP ASE.
Please take a look atSAP Sybase ASE documentation
SAP Applications on SAP Adaptive Server Enterprise (SAP ASE) is an extremelly helpful link where you can find related content on SCN.
Kind Regards,
Ionut