Most maps you download from the forums are ready for extraction to the main blockland folder. To put that into edible English, If you download a map with a .rar or .zip extention, open it (with WinRAR,
http://www.rarlabs.com) and see what the first folder is called. If it is called 'base' (no caps) then press the extract button up in the top toolbar of WinRAR. Extract it to C:/Program Files/Blockland.
If the first folders name is not base, then post what it is called here and i will help you...