zipping a movie won't make much if any difference to the file size. Generally the movies available for downld are around cd size (600-700 MB.) But any size is fine. If you'd like some links to some sites for dvd & video stuff, try: 1.
http://www.videohelp.com/ & 2.
http://forum.dvd-guides.com/ These links have tools available, articles & forum.
For sharing just put it into a folder & select that folder for sharing. Tools>Options>Sharing>Add & direct LW to where your folder is & select it. Then press the Apply button.