Camprax,
As far as I am aware you can validate your licence with the IAA for one year, probably longer as it's all about money. You can do the 14 exams if you like and obtain the JAA ATPL during your first year of validation, but it's alot of work especially if you are going to be doing 12 hour duties.
As you don't have the rating on the 737 they may ask you to pay for this or they may bond you. You'll go in on the FO rate which might be anywhere between 45 - 75 euro an hour depending on which day of the week you start.......more than likely you won't get offered a permanent position and will be forced on the Brookfield contract.
You need to pay for everything while training, you'll have to pay for your medical, licence conversion, and maybe work permit if from the States. You wont get payed until after line check, so budget for at least 3 months from start to finish before you are on the payroll, well could be longer as you'll need to do a type rating......maybe 6 months.
Sorry lads repaweb.org is not open to non employees, but in the future it might have limited access.