When creating the 11gR2 DB, the best way to do it would be to use the OCU. That will create the DB for you with all of the options required for Windchill. If you aren't able to use the OCU, then article CS36056 gives the instructions on manually creating a Windchill DB in Oracle:
https://support.ptc.com/appserver/cs/view/solution.jsp?n=CS36056
For the export/import of the DB, you should be able to use the same procedure as given in the rehost guide. Take a look at the "Exporting Database from Source System and Importing It into Target System" section of the rehost guide, on page 3-10:
http://support.ptc.com/WCMS/files/105438/en/WC91RehostGuide.pdf