If you new to BT, then I recommend that you use Azureus as your client.
http://azureus.sourceforge.net/
Check out
http://www.azureuswiki.com/index.php/User_Guide for how to use it.
It's not that we do not want to help you. It's just that there is too much to explain.
In a nutshell.
Find a Bit Torrent Tracker site
Search for what ever you are looking for.
Once found, make sure it has SEEDS. If SEEDS = 0, then you are going to have problem downloading.
Download your torrent file.
Open torrent file in Bit Torrent Application
And then start downloading.
BTW, remember to share. For every Mb that you download, make sure you upload the same. Otherwise the bit torrent site might black list your IP Addresss.
Please note that you might need to sign up for a membership at some Bit Torrent sites.