Blogs of Notts

Oracle consists of so many of products, you need to assess the product itself and decide as to what segment within Oracle umbrella you wish to focus on.

For instance, Oracle Developer (PL/SQL, SQL, Forms, Reports etc), Oracle DBA (maintaining/tuning critical DBs, backups etc..), Oracle/Hyperion (Data warehousing, BI), Oracle Application etc..

Once you decide on which area you wish to focus on, I would definitely take an Oracle class to get a quick jump-start either thru Oracle University or other 3rd party companies that provide Oracle training.

Once you do that, you can use the combination of the Internet resources and Books as well.