hahaha depends why you bought your burner. Sounds like you bought it with the sole purpose of copying dvd's. I bought mine for both backing up (after one of my HDD's died & had a hell of a time backing everything up) & also to create my own dvd's for both personal stuff & commercial sale from full quality digital & analogue video sources, & using professional video & dvd authoring & editing tools.
I think you need to go here: 1.
http://www.videohelp.com/ & also here: 2.
http://forum.dvd-guides.com/ also see:
http://www.videohelp.com/tools
If you have a dvd 9 format burner then you won't need to shrink anything.