I used to be on the WWD Roster.
1) It works as a pattern you decide upon.
2) As many duty days as you nominate to fly. They won't fly you home weekly. Realistically probably 3 to 4 weeks on min. Off your call.
3) Look at the daily rate and figure yourself if you can live on the money. The more days you work the more money you make.
4) High season is usually Hajj (The fun part) Low season is when they don't need you.
Take the fixed patterns e.g. 6/2 - 4/2 or whatever they are giving out these days. Then you can plan your life accordingly. If people weren't making money they wouldn't be there.
Cheers,
Pete.