On etiquette, I suggest:
1. half the space is yours - one end of the bunk, or one-half the end if there is only one end
2. half the space under the bunk is yours - divide laterally or longitudinally
3. a chair is for everyone, not for storage, particularly of your pack
4. hang your pack on one corner of the bunk; that will provide some bug protection
5. try to get a consensus on lights on/off; if a brazen person turns the light on or off at a ridiculous time, try to work it out amicably, but it is not his/her unilateral right to control the bunkroom; be reasonable at all times.
6. there is no maid service, so pick up, mop, scrub, and sweep after yourself
7. don't waste energy on things you cannot control, such as gas passing, snoring, others' conversations, other people using electronic devices unobtrusively, sharing cookware, etc.
I am betting there are other suggestions!