Starting salary is around 39,000 with around 6,000 a year allowances on top.
In the past time to command has been quick as going from 2 to 4 aircraft doubles the requirement for captains etc. Now with 7 aircraft each new one generates a lessor increase in the number of captains required. More recently command times can be 2-3 years for people with commercial experience and longer for those with low hours. With a flying rate of only 650 hours a year it takes a while just to get the minimum hours (2000 off the top of my head).
On top of that you would have to join the queue as there are a lot of FO's ahead on the seniority list who are in the right bracket for getting a command.
I believe the plan is to go to a total of 10 aircraft in a mix of 320/321.
There have been plenty of other posts regarding lifestyle, rosters and such like at BMED. If you search for those much of the info remains true.
Hope this helps, all the best