Although this is a great guide... I'd just like to mention that this may be harder to get off the ground than most people think.
I've played tons of MMORPG's for many years. Everytime I bought gold, or knew of someone else buying gold it was a purely viral market. I would ask people, not search for it. I played WoW from day one, up until about a month ago and I've never been to any of the sites that were listed to host on here, not saying they are bad... just saying they might not bring as much traffic as users would think.
Basically every last person I knew bought gold from IGE.com and only there. Didn't even think about anywhere else. Even a friend I knew did this program from IGE.com. I didn't know much about the system then but I still did not trust him even though he told me it would come from IGE.com. People just really like to go with what they know and what everyone else uses for the most part. A huge reason being they are scared that they will get caught buying gold and maybe banned for it. Or just wont get the money flat out at all... sorta hard to sue a company that doesn't give you something you could never prove you got or didn't get.
The only way I can really see this working is if you have the time/money to make accounts, make a new toon, log onto each server, spam your site, then get banned for sure.
Just be wary that this might not be a very easy thing to do.