How to get started with player-to-player trading
I just started playing GW a week or so ago, and recently found out that each account can get 10 free Zaishen Keys. I've heard that these sell for a fair amount each, so as I've reached the Eye of the North I wanted to sell the keys in order to afford some perfect armour.
I'm not really sure how I would go about finding a buyer for these keys, though. I've heard that Kamadan is the main trade hub, but I don't know where that is. (My character started in Prophecies, but I have reached Lions Arch and unlocked world travel, I'm just not sure how hard it would be to get to Kamadan). Should I be heading there anyway, or do I stand a decent chance of finding a buyer in Lion's Arch?
And what's the general procedure for selling? Do I just put "WTS 10 x Z-Keys" in the trade chat and wait? Do people generally expect a discount for buying in bulk, or is there anything else I should know?
(And could I get a price check on what to expect for my keys, before someone offers me 100 gold each?)