Much of this is covered in the manual, so be sure to
read that section 
1) 5 minutes of presentation, 5 minutes of Q&A with the judges
2) No setup time. Assume the clock starts when you walk in.
3) The Video is officially not part of the judging process. Some teams choose to show it during their presentation, some do not.
4) See above - 50/50
5) I don't know, I'm not on your team
Edit: you may find the
Talking to Judges call posted here very useful. Notes are
here.