Altho not junior, having flown wth guys who are i think the rosters for junior guys will include a fair mixture of trips.
You would get a Blind Line most months, meaning that most trips would be allocated to you from the trips no one else bid for. But one trip would be chosen assuming you were able to get a seeded BL. That will mean you will be working most weekends, but you can request them off, altho thats just a preference. As for days off, well that varies depending on what kind of trips you get, and how clever you are in placing your seeded trip, but will be around 10 - 14 days. If you're looking for an airline that doesn't work too hard, look elsewhere!
There aren't that many 2 crew trips on the fleet, but you will get a fair share of the ones there are.
I'd guess you would generally get Naritas, NY's, LA's, Lagos', and Washingtons. Having said that anything is possible on Blind lines and the fleet contains a huge variation of trips.
All in all it's a great fleet to be on, and doesn't have many unpopular trips.
All the best.
Edited to add that roster stability is very good, had just 2 trips changed in 9 years.