I'm not with Ryanair, but I'm pretty sure that the best place to find out more information about the airline would just be to check both ryanair.com, and also the information from the company's training providers.
Ryanair cabin crews have to pay for their own training with a Ryanair-approved training company. I'm not sure what else they have to pay for, or what the pay is like, but I remember reading a large portion of the salary is from commission.