As you only joined yestoday, ill do a whole tutorial:
This section is Add-Ons;
Add-Ons are user created items/scripts/events/mods/vehicles, anything that doesnt come with the game when you buy it is a user created Add-On.
There is a Map section too;
Maps are.. well maps. These are some reason called missions too.
Chances are you dont know how to install Add-Ons and maps etheir;
When you go onto a topic like this one, read what it is, then if you want it, look for a download button. If a new window/tab comes up then look for a download button on there too, then a different window should come up, press "Save as" then "Ok". After a while it should download (1 sec - 10 mins depending on size, and internet connection speed) if you use Windows Vista then press "Open Folder", you should now see a folder with the Add-On/Map in it. Or for non-Vista users, go to your Desktop. Now open "My Computer", go to the "C" drive, then "Program Files" (or where ever you installed Blockland), then "Blockland", then "Add-Ons". Now move your downloaded Add-On/Map in here, yes even maps, then close it all down. When you go to "Start a Game" on Blockland, if its a Add-On (NOT a map) click on the Add-Ons button, now check the Add-On youve downloaded (Usally at the top of the list). If its a map where it shows a list of map names, look for the one youve downloaded (Aphabetical order). Now when you go to start a game you should be playing with/in it.
I hope I didnt skip anything, bad mistake if i did.
On topic: Nice but i wont be needing as i cant host.