On my server, there's only ever been one rule: Red ==> dead.
I generally follow it, though sometimes, I'll let people go if it's not worth my trouble. One personal rule I have is no corpse camping. And honestly, if I get ganked while killing a mob, it's my own damn fault for not being more aware of the situation.
Other question is, Battlegrounds and Arena (the goblin one that I think opened up recently). I've never stepped foot into either, and I'd like to try, but they are sort of intimidating to me. I'm worried I'd get into one, be totally in over my head, and then the people I got put with would be pissed at getting such a loser teammate.
Battlegrounds are probably the best place to get experience. The key thing about PvP is to know other classes and how they work. What their abilities are, what their spells are, what their cooldowns are, etc. Now, none of that is
necessary, but if you want to succeed, it's what you'll have to do.
Totally depends. In a Battleground, you can just hop in and **** around and I'm sure nobody would even notice or care. Pugs are usually just disorganized and are going to lose. Knowing how the battleground works is also a necessity for victory, but it's also a way to get annoyed when people aren't doing anything right, heh.
Do you have to be the kind of person who spends a lot of time and money beefing their characters up, or is it a fun time for people at any skill level?
It's not too bad right now. Skill, unfortunately, doesn't always matter. A lot of people argue that there's no skill involved in WoW PvP, but knowledge of classes really does help. Also, having an awareness of what's going on around you is a big thing. In Arathi Basin, a rogue blinded someone while I was capping a node. Then someone attacked and broke the blind, allowing the alliance player to interrupt me while I was capping. The three of us then killed the alliance player and I went back to capping the node, but by that time, reinforcements had shown up from the graveyard. If the alliance player had been left blinded, I would have capped the node, the ressers would have gone elsewhere and things would have gone quite differently. Little things like that go a long way.
Also, you'll never be able to gear up doing just PvP. The Arena stuff is amazing, but I garauntee that the top Arena teams will be made up of people who have Kara cleared already.
And is one better than the other for somebody just getting their feet wet at this whole PVP thing?
Yeah, as I said before, run battlegrounds. They're very controlled, but they're good for learning. World PvP I would argue is the best place to learn, since you're forced to think fast. I've got a number of strategies in my head for how to deal with gank attempts, depending on class, group size, etc. Hell, even just getting away from a fight you'll never win is a valuable skill.
Hope that helps a little.