I Can give a small tip; But experts here will provide you with more;
For a best Oracle Admin skills, you should know how to write complex queries, so you need to test yourself in writing queries. Database Application development will help to increase your skills;

And if you are looking How to start as fresh in this oommpetitive world, start will new technologies;

And in Qatar, .... i dont have any idea;

Money will come your way if you are in good office, and if you are skilled;