Hi Zobair
1. Your Steps 1, 3, & 4 are correct, but the step 2 you have to check with SAP PAM with current SAP R3 system migration to windows 2008 R2 with Oracle 11g is not supported. Kindly refer the SAP PAM link
2. On Windows 2008 R2 require minimum kernel level, Kindly refer the SAP Note
1383873 - Windows Server 2008 (2012) R2 Support
3. Refer the Windows 2008 R2 FAQ
Frequently Asked Questions - SAP on Windows Server 2008 R2
Regards
SS