presuming that OS is installed and all the required OS patches are applied.
the high level steps includes ...
1. prepare file systems to store DB files (co-ordination with storage admins)
2. test the OS level fail over scenarios like NIC failure, HBA card failure etc (co-ordination with system engineers / network engineers)
3. if you are using cluster (active / passive) then test fail-over scenarios for the same (co-ordination with system engineers & cluster engineers)
4. install Oracle binaries and patch it as par your requirement
5. create DB
Try hard to get what you like OR you will be forced to like what you get.