Help make Client connect to localhost

Hello Guys,

i am currently just learning by doing ... i want to emulate the login of Ragnarok Online...

I updated my gameclient to the latest version... .. I did some research about those two packets that get send to login.

Well, i didnt download any server files yet, but i guess there are three servers... a login server, channel/character server and a world server... because i found 3 different ports the client connects to...

but i just want to emulate the login because this should be pretty easy...

well but i cant find a way to connect the client to localhost....

how to do it? how does the client get those ip´s it connects to?
Can any body help me?

My really only problem is to get the client connected to me.