I've split your post off into its own thread and placed it in the certification forum. I think this is the most approrpiate place.
When considering certification options, I always say you should certify in a technology you are likely to use. There is no point in doing the certification in developer if you don't plan on being a developer!
Likewise with database versions. If you think you will use 10g a lot, then you should certify in 10g. If not, then jump straight to 11g. This page shows you to the upgrade options:http://education.oracle.com/pls/web_pro ... page_id=44
That site should be the first place you look for exam information.
The desupport notices will appear at least 6 months before the exam is desupported. The 9i track is still present on the website, which means there is no desupport notice yet:http://education.oracle.com/pls/web_pro ... age_id=152
If I remember correctly, the 9i product was desupported in 2007, but it is under extended support for some time provided you pay the extended support fee. You will have to check with Oracle to get specific dates. When releases are desupported and when they stop being used are not the same thing. There are still people out there using Oracle 5, 6, 7 etc.
What you do after OCP is totally up to you. Personally, I think your goal should be to get some experience. Few employers will hire on the strength of certification allone. The quote, "due to its huge demand, good pay and better future prospects", is not necessarily the case in the current economic crisis. I suggest you try to find employers in your area that use Oracle and approach them about work. I worked for free for a time to get my first job. I was later give a job. That's an option, but it's not good financially.