Celia Cyanide said:
One bit of advice I can give you, speaking as an actor, is that you need to watch out for agents. Where I live, you can do anything you want, and you can go through your agency, or not. But out in Hollywood, actors sign exclusive contracts with their agents, and everything is negotiated through them. You could have an actor who is VERY interested in your project and sincerely wants to be in it, but his/her agent won't allow it. I've met a few screenwriters who had famous actors tell them personally that they really wanted to be in their movies, but the agencies didn't think they should do it.
Indeed and this differentiates beetween "interest" and "attachment."
Interest can help sell a script; it can get you reads through a recommendation by the interested party, it can inspire a producer to move forward with getting a project packaged, it can help affirm the quality of your work. Attachments usually come after a sale when a producer is packaging, he's looking for a director who will commit, an actor who will commit, a composer/arranger who will commit, and so on. He gets enough commitments he can then approach the money guys with more than just a script, he's got the core components of a whole deal.
But commitments always have a back door exit, a clause that let's the committed out if they're offered something better. But they are hooked also to events, and the closer a picture moves toward a greenlight, the harder it is for a commmitted person to back out, until eventually a point is reached where they cannot back out. Packaging is one of the industry's higher art forms.
A deal to produce a picture is like the most complex meal you've ever prepared, and for those of you who cook, you know that timing is everything and may well involve cascades of events in which one ill-prepared ingredient or ill-timed event can ruin everything and cause a cascade to blow up and become completely unglued.