this has been asked many, many times. i prefer 1-2 spams in trade chat (/2 anyone buying blah blah? i'll sell for cheaper than AH). they always ask "how much do you have?" i say "a ton, how many stacks u need, 10, 20, more?" and some will say "as many as you have" tell them the truth... tell them "i have over 1gtab of this <whatever it is>" are you sure? and if they are willing to buy 1gtab (96 stacks) then go with the flow... if not, most will say "cod me 10,12, 40 stacks"
a 2nd option is putting 50-100 stacks at a *lower cost* on the ah of what you get a lot (icethorn, lichbloom, adder, sar ore, etc) and then check to see if someone bought a bulk amount of your product ... if they did, send them ingame mail with an advertisement for your goods. i have many buyers this way and the only way that i can keep so many bots on 1 server
now... you need to read this thread below:
http://www.buddyforum.de/showthread.php?644-Chatroom-Rules-HowTo