minecraft server is easy to make, make sure port 25565 is open.also download the minecraft_server.jar.then just open it, you will get a GUI with all informationbut this is just for maximal 3 players (without lagg).the minecraft_server.jar is restricted to maximal 100 MB ram, it will use 90% of it already on first run.download Craftbukkit server MOD. also try to run it from a cmd promp will make you to increase performance of the server and eventually when you got a good server machine you can run over the 255 players at the same time.