After you install uTorrent open it up go up to the left hand corner of uTorrent and click file > create new torrent
Once you click create new torrent click Add File
After clicking Add File search your file you want to make a torrent for example I'll use ThreatExpert Application (make sure you check the box next to start seeding before you click Create and Save as
Once you've selected your file and checked the box next to start seeding click the button Create and Save as... a box will appear just click yes, you will get trackers off the site your uploading your torrent to.
Once you've click yes it will then make your file you selected a .torrent file you then save it somewhere.
Congratulations you've now created your .torrent file to upload to torrent sites.
Now for the seeding part to seed your torrent file.