Where do I put my files so that people can find them on the web?
When uploading to your account, keep in mind the structure listed here.
Directories:
HTTPDOCS - Non-secure public folder
HTTPSDOCS - Secure public folder(With Plesk 8 you can assign the HTTPDOCS & HTTPSDOCS to be one single folder)
CGI-BIN - CGI script folder, also publicly viewed