Your profile says that you're still at school! Good for you in being motivated to learn about stuff now. My advice - wannabee and all as I am - would be to start learning your ATPL theory and then worry about the big jet info during your type-rating.
Trust me, I've been down the road of studying checklists and manuals and found them a chore, but now that I have been doing the ATPL theory for a while, I find it much easier to understand!
Best of luck to you!
