[Adrian Minde] “Will I be able to import the footage with FCP and give them the source files?”
Depends on how you capture them. FCP supports a LOT more codecs then iMovie does.
[Adrian Minde] “Or will I have to convert the files?”
Possibly again it depends on how you capture them.
For example if they do not have FCP on their computer then they will not even be able to play FCP specific video codecs.
I would play it safe and just capture the footage for them in iMovie.
**Hindsight is always 1080p**