a torrent really only works well if you use a tracker to share the .torrent file.
from
http://www.utorrent.com/documentation/make-a-torrent
The Tracker
A tracker is an application or script on a system that relays connection information about peers on a given torrent. However, it is most important since without it BitTorrent clients would not know how to find other clients sharing the same files. µTorrent knows which tracker to contact by reading the announce URL in the torrent. Trackers generally look like any other internet address (http//somewebaddress:portnumber/announce). If you need a tracker you may:
* Check the site where you wish to upload the torrent.
* Private sites usually provide their own tracker.
* Public sites may also provide their own tracker, or include the URL of generic ones.
* In a pinch, look at the properties of a torrent you have downloaded from the site you wish to use and copy the tracker from there (but in such a case wait to test the torrent out before uploading it to the site as even those tracker may require you to have registered the torrent with them first).
µTorrent supports HTTP and HTTPS (SSL) trackers. UDP trackers are not supported. µTorrent also supports torrents with multiple trackers; trackers from the same server (with similar URLs) must be grouped together and those from different servers separated by a blank line.
µTorrent contains an "embedded tracker" intended for people wishing to share with a small group for a short period of time. This should not be used for sharing torrent over public or private sites, but only for private stuff and over short periods of time (along the lines of family movies shared with friends and such).
* The embedded tracker URL is: http://your_ip_address:port/announce (where your ip is your computer's ip address and port is µTorrent's listening port)
* The embedded tracker must be enabled in: µTorrent menu > options > preferences > Advanced > bt.enable_tracker: set to "true".
Warning: Using the embedded tracker requires you to have the same IP address and the same port as long as the torrent is active. This means if you use a dynamic IP and randomized port and get disconnected from the internet, your IP and port will get reset, and the torrent will die.
and
Making your Torrent Available to Others
The most common way to do this is to upload it to a torrent site. If this was your intention you should have read up on the site's policies, rules and procedures of that site before uploading.
Uploading the .torrent
1. Using your web browser, go to the site (log in if needed).
2. Navigate your way to the upload page, and follow the instructions provided.
3. Some sites allow you to add comments and descriptions. Try to put something you would find useful as a peer.
Do not panic if the torrent just sits there without uploading, it may take a while for other people to notice the torrent and start downloading it. It may take longer if the content is something obscure with limited appeal.
sharing 20GB over a webserver with more then like 5 people could well result in either high charges of your webhost or canceling their service at worst (costs them more money than they make of you).
++ c.
ps: you dont have to upload the media files, only the .torrent files. but you need to use a tracker server and enter the tracker url while creating the .torrent files. as mentioned, it's best to do this with a small file for a test first.