Noobie

Hi, Can some one help me or tell me how to make a private server ragnarok online? im new in making server this is the 1st time that i want to make my own server. im a old player ragnarok online . I hope some one help me don't worry im a fast learner 1. what do i need to download? 2. what to do? Please help me thanks in advance. sorry for my bad english