Minimum hours you need will be around 200, however I have seen a few people employed with less than that, and they did ICUS in the C210s until they got to 200hrs. Most operators have a minimum 200hrs total time for 200 series aircraft due insurance.
Cessna 200 series time is not important. Go and get a C210 handbook and study the limitations and systems, so you know the numbers come time for a check flight.
Most operators hire in early Feb, so they have a full compliment of pilots for the start of the dry. But there will always be positions that open up.
As for meeting pilots, if you work behind a bar, they won't be too hard to find.
If you need a place to stay, check out the notice boards around town (Broome), always a few rooms being advertised.