yes there are ads and internet. but they will all be in korean and like you said you don't read or understand it.
from what i know do to gangs running prostitution in korea you won't find any indys like in US and due to police crackdowns most incall, prostitutes, or soaplands won't be in clear view these days. they are now off site and you are taken there by the screeners..ie....drinking bar scouts trying to persuade you to get into their clubs and also to make sure your not a cop.
but the "scene" is the same everywhere in korea. all cities in korea has a bar scene and prostitution agencies. when night time hits just find a taxi driver and say you want bar and women. thats it. i guarantee you that taxi driver has seen a prostitute himself will know the area to take you. once you get dropped off in the bar area unless your the most ugliest and dirtiest guy on the planet some guy will approach you to try to persuade you to enter their club. even if don't speak full english that bar scout will somewhat. then just make it clear what you want...one of them will say yes.
price wise:
room salon prostitutes are 250,000 won and up. but since dajeoun don't pay more then 250,000
soapland incalls: 150,000 won
outcalls to your place: 80,000 won
dont pay more then this. if your nonkorean they will BS you to pay more.
service is less: if your nonkorean. don't expect kissing or rimming or cim