Moving over from official server
If you have already a working minecraft server, but want to use Mineserver, you can easily move over!
Preperation
First of all, make a backup of your whole minecraft server. If anything went differently form your expectations, you can always go back. Second, make sure your Minecraft world is in "old" Beta 1.2 File format. As of 26.2.2011, Mineserver does not support the new Beta 1.3 File format. Beta 1.3 clients can connect tough.
Do the work
Installation Mineserver in a directory on your server. Edit the settings file to fit your needs, copy your world to the desired path and make sure the path is correctly specified in the settings. That's it! You can start Mineserver and start playing.
What's about plugins?
At the moment, there are not many plugins. But you can write your own - just check the Plugin API.