One thing i would say is keep it simple-bring lots of props (rucksacks, knives ropes, psk etc.) don't rammble on, GET TO THE POINT (as a boy scout a few years ago one thing that was very boring was how some guys rammbled on about SH*T sorry but that was the case also be animate make them laugh have a bit of fun, get people out to the front!
KEEP them busy!

k my thoughts

Mark