Bags are fine, notes are fine. Do not let any slip out or you may wind up in trouble. Do not leave any notes on your person or leave your phone on your person. If you get detected with these, it will be hard to defend against a cheating charge.
As for pencil case, never seen the need, could you just mepty things onto your desk? Long as there are no notes or lose pieces of paper in the pencil case, the worst they will probably do is tell you to put it under the desk. Alternatively, you can put your hand up and just ask the invigilators for advice (do it near the start).
I'd argue in some dimensions the rule are less strict than VCE. Your water bottle doesn't need to be clear and water only for instance. You can bring in as much food as you like, if you really feel the need, you could bring in a bucket of fried chicken. On the other hand, if you are caught cheating/with notes on you, it's a very judicial process (you're allowed to have a lawyer if you're summoned before a committee). It can be very grueling and stressful to deal with. Arguably, the consequences are more severe than VCE as well.
Turn your phone off, disable all alarms. Even if it rings in your bag, under your desk, you still will be fined (happened to an old user here).