As to sharing, it would depend on what they are going to use software wise. If they are using iMovie and they want the best quality, then give them the iMovie project file. The challenge will be how to get them a 100 GB file...someone will have to make use of an external hard drive, me thinks...whether it is your drive or theirs is a question for you to resolve. If they are not going to use a Mac with iMovie, then you will likely wany to export it to some more generic format. I will let someone else advise on which might be best for that as I am not totally sure.

If you want to do individual clips, then it looks like you can use the Share command to create "full quality" QuickTime movie files for each clip. Or you can choose some "lesser" quality settings to make the files smaller. This would be using the "Share selected clips only" option (you select the clip and then the Share command).

But, what quality level did you select when exporting/sharing? Full quality?

And how does it look if you play the clips back directly in iMovie? Keep in mind that playing something on a TV hidees a lot, potentially even an HDTV. Most computer screens are significantly higher resolution than Standard Def TV and can even be higher resolution than HDTV. As a result, something that looks great on a TV might look like crap on a computer monitor, especially if you are watching up close and personal.