Assuming this is a FutureQuest hosted site than the following would apply...
FTP Hostname: ftp.example.com (replacing example.com with your actual domain name and extension)
If you have lost your username and password for a FutureQuest hosted account send an Email to Service@FutureQuest.net
from the primary email address listed on the account indicating what you need and what domain it is in regards to.
Regarding the directory structure, you would create any files and directories that you want accessible via the web within your /www directory and depending on how it is created and how you intend them to be viewed you should be able to use absolute or relative links if you wished.