Hi Rao,
Please refer to upgrade guide. you have got plenty of activity to do.
1. Stack file which you need to generate from solution manager
2. Download the Correct /latest SUM tool
3. download those patches.
4. Download the kernel
5. Copy them at appropriate please
6. Initiate SUM
7. Provide the inputs, with no of jobs, passwords, some passwords from notes.
8. Create NewTablespace and extend other when required
9. Backup before and after
10. Plan for downtime
11. Plan for shodow instance.
12. SGEN
13. Stats
14. Make sure about the transports.
This is just some of the task overview.
Cheers,
Deepanshu Sharma