You can buy a few books, do self reading and learn. But I wouldn't suggest that. I would suggest you take a basic fundamentals course on Oracle (SQL, PL/SQL, Architecture) and do a pilot project as a part of the course. Its much faster than self-learning. Today, Time is Money, Money is Time. So don't waste time as some Guru's may suggest self-reading. Try to escalate your knowledge at the fastest way, regardless of how you do it (that's my personal philosophy).