Nektonic
Veteran
Though that is a solid strategy, 2 months prep is on the long side for many of us unless it's a biographical or heavy research type script. There's no de-facto process for prep. The script I'm meeting with ICM on right now had about 5 days intensive prep and 45-60 days of writing the first draft. Each one of my scripts has it's own organic process, yours should too. No stories are told the same way, developing them is no different.
Just thought it was an important caveat to make.
This is one of those things that I think is very difficult for those starting to write to figure out. I've always been a know where you're going but don't plan everything out too much kind of writer. I like to have a map because it is easy to get lost in the woods, but I also like to be able to wander from the nature trail if it feels right. What happens if you see a Sasquatch or come in contact with an angry bear?
I've recently decided to write some of my story ideas as novels instead of focusing solely on screenwriting, and am currently reading a book called On Writing by Stephen King. His method is very different from the heavily structured one that screenwriters use. Basically what King does is create his characters and situation, and while he might have some idea where he thinks the story will end up, he doesn't begin by plotting it all out. He feels that since our lives aren't plotted, then his character's lives shouldn't be slaves to a pre-determined plot either. This way he is experiencing the events as his characters do, and not as an outsider. Those are not the exact words he used but my summary of his technique. Not saying that everyone will or should do this but I like the philosophy behind it and might try it out.
Anyways, just thought I would mention that it is a good read. Even though it focuses on techniques for writing prose fiction, I think that there are some valuable lessons and tools for screenwriters as well.