It is important (especially with the Airbus) to not study too far ahead. The training department will more than prepare you and tell you exactly what you need to know. If you can get hold of our VOL 2 Section 2 and 5 then the only thing I would recommend studying would be the required limitations and memory items at this point. Try Quizlet. Youtube also has some CBTs floating around that are useful to start getting familiar with the systems.
Congrats and do not pay attention to the naysayers. You are getting on at a great time.