Lots of young FO's on the waiting list to begin line-training on B737.(including me!) Flight-Pay is 18 Euro/hour for line-training copi's. You are not guaranteed to be offered a permanent contract after your line-training.
FSB (Flugschule Berlin) is practically their training department, you might want to contact them.( quality is top)
At the moment, B737 operations at GMI is very unsure, with rumours going from total elimination of the fleet to a major increase to replace "not so suitable" F100's...