You can try to answer all of their questions before they answer them, but this may not help you with spontaneity and persuasion. It is best to already know everything about your film so that no matter how they phrase any question you will be able to answer it clearly and within the context of your goals. What this means is you have to look at your potential project from every angle and see any problems that could occur and anything about the film that someone may want to know. If you do not know the answer to any of these questions then you need to investigate it and make a decision. This does not mean you have to know everything about the future creative process or production, but you need to be able to answer everyone in a way that will satisfy them. Go through and figure out four different reasons why this film will be successful in gaining an audience, changing the culture, and being financially responsible as an investment. Make sure you are able to explain what is important about this particular film, what themes it will focus on, and why you are specifically the one to make it and not someone else. Tell them why it needs to be made now and who will want to spend their time and money to see it.