You may want to check out the film "The Big Picture" if you haven't already.
It is a "Hollywood" version of what it takes to break into the industry
as a screenwirter. I'm not sure about how accurate of a representation
it is -- but it may be worth checking out. Also, there are several short
30 minute tapes made about professional screenwriters and their advice on
breaking into the industry. I'm not sure who the distributor is, but I
know a friend who has them and I'll get you all the information soon.