I am not a filmmaker (yet), but I have started a charity project that I want to document and eventually release to the world.
Not looking for Sundance entry, just simple documentary to inform and entertain.

First Question:
I have already started my project, then decided I would like to document on film.
What are the rules for recreating or shooting events as if they are happening real time, is this acceptable or is this lying?
Example, shooting an interview with a person as if the first time, but have already talked with this person? Or shooting a scene where I start a task, say like painting a wall, but I have already painted the wall prior.

Second:
What are the legal aspects of shooting a documentary?
When interviewing subjects for a documentary, do they need to sign legal forms? If so, where do I get these forms? I live in Boston, do I need permits if shooting quick scenes outdoors? Most scenes will be indoors or at a business.

Third:
I would like to score with music, what are the legalities on using music snippets in my documentary?

Last:
Any good documentaries I can view to get ideas? Saw parts of King Of Kong and liked it, what else can anyone recommend?

Thank you in advance for any help.