Uploading system

Hey… I’m doing a website for my school (pretty cool)

I need tutorial or source file for a uploading system… Like…
When you are on the website you can login (i don’t need a login script)
and in there you can upload a word document or a open office document, and it will go on the server… Plus I need a site where the links to the uploaded files go… So you can download them directly from the site… Can anyone help me ???