How do I move a Minecraft saved world from my desktop to my server?

I wanted to create a flat land multiplayer bukkit server, perfect for building. I was able to.

Yes, there are saves in %appdata%\roaming\.minecraft\saves that you can use. All you need to do is drop it into the server folder after you create it and specify in the server config file (World_Name=) and write the name of you world.