This week the server will have a Christmas world on it. You will find the portal to it it at the spawn.
Today (Sunday/Monday) the server is currently the test server. The test server is using a copy of the current world. This was done to test out a couple of new mods for the server. The first is for all the redstone people. This may make it to the main if everyone likes it.
I would suggest reading over this page
especially the videos at the bottom for help. When you decide to test this out go to the desert left of the spawn. You will find an area I have created with all the items needed and you can type /mimic you get them.