Opportunity means seizing chances in life. Scan the notice boards and look for vacancies. Create your own chances by offering to work for free, or at very low rates. We can't create jobs from thin air but we can hunt down the ones that do exist.
Timing is vital because even the best graduates won't find a job at a company that isn't hiring. Media companies expand and contract according to their projects and their order books. Knowing who is hiring and when is all part of winning the game.
Luck is about being in the right place at the right time. And, of course, making your own luck wherever possible.
Persistence. Of the five, the last is probably the most important. Stick-to-it-ness is vital; don't give up. Keep practicing, working, and getting better at what you love doing, and you will be rewarded.