Best settings for using high res photos in elements 11 video?

I'm using around 80 high res photos (taken from Canon Mark IV) and making a video to be played on DVD (will be shown at a banquet). Once exported the photos look pixelated.  We worked with scaling and tried figuring it out - it appears from some things we've read the settings needed to be changed when we first created the project.  Because I have probably around 10 hours already invested, I'm hoping somebody can tell me what the appropriate settings are for the project so I can start a new one.  I'm using premier elements 11 and adding a few title slides and music. Nothing fancy.  Thanks!