Regarding 'not being a jerk', as they say "good men don't need rules". If you're doing something with the mindset of 'well, technically I'm permitted to do this within the letter of the rules' you are probably still being a jerk.
Generally a camp is the static spawn mobs in the area immediately around you.
Generally you can only camp one item at a time, and if it drops you should give up camp to someone else.
Roaming mobs tend to be FFA, but if there is a limited supply in an area it is good to do a /who all (zone) and send a few tells before travelling there, otherwise both you and the other jerk already there will probably be making bad xp
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On the whole I think it is more important to act within the unwritten social rules of the game, which you can only really get a feel of by playing the game and interacting with others.
Note, the rules are written on a more gist basis, so just because you can dissect the words of the rules in a way that might support yourself/penalise the other guy doesn't mean the staff will be on either of your sides.
Also note, the staff are volunteers and might not always have the time or motivation to deal with everyone's stupid shit in the most cordial fashion.