Oh now... mmmm... that's really a big question. I believe the stake is two-fold:
1-The delivery: The message is adressed to a general audience ,I presume. Therefore it has to be written and produced in a way that makes the core principles easy to understand. There must be a lot of examples and ways in which the principle can be applied.
2-Topics (non-exclusive, just from the top of my head):
-What is property
-What is a property right and why it is important.
-What is force, initiation of force.
-How do people freely enter into volountary exchanges.
-Why are volountary exchanges better than other alternatives?
-What is the subjectivity of value and its role in trade and human affairs?
-What is the difference between rights,laws and morality.
You may also want to answer the following questions:
-Isn't anarchy a synonym of chaos, violence...?
-What about education?
-What about healtcare (especially for places like here in Canada)?
-What about the roads?
-Woudn't it cost me more to adhere to these principles instead of being a free-rider under socialism?
I don't think you really have to go as far as stating "and this is why governments are bad" . Maybe you can focus on the very positive aspects of market anarchy and prensent it as a viable alternative and state your point clearly and logically. Coming off as a proponent of market anarchism is propably better than as a critic of the current system (I don't see this as being a bad thing, but we are talking about a general audience here). Make sure you have some booklet with sources for almost everything you say (maybe even provide a transcript of the DVD with the sources?) and that its quality has been verified by a couple of quality individuals.