This is about a month old and I am sure you have figured it out by now, but if not, here is your response.
Since you are in the
New Join Forum, all you have to do is check out the FAQ pages above this post. The first one you should familiarize yourself with is
http://www.runuo.com/community/threads/runuo-ultimate-little-guide.72822/ this will get you started on what you need to start creating your own server. Next, you should take a look in
http://www.runuo.com/community/threads/basic-files-and-descriptions.58349/ to get an idea on some of the more common files people edit first. From there, just search around. Look some more in this forum, you will find a lot of older users that are returning to the game who are trying to brush up on the changes since we were last here. Then go to the Custom Script forums to see if anything tickles your fancy and looks like something you may want to add.
Hope this helps out, and good luck to you. If I actually stick to with it this time, maybe I will have something to show my kids (which has been my plan off and on for 3 yrs now).