As a newbie writer, I've been reading all sorts of books on writing. But what's really frustrating is I keep getting conflicting advice:
Don't start with dialogue.
Start with dialogue if you want immediacy.
Don't start with expository.
Establish a voice.
Don't have dialogue on the first three pages.
Get the first three pages moving quick.
Break the rules.
Follow the rules.
There are no rules.
Write with formula.
Don't write formula.
Don't start with backstory.
Unless it's really gripping.
Don't start with scenic description.
Unless it moves the story.
Basically I've decided this. There are certain elements that need to be mastered. If you can master them, then you can do whatever you want and still sell.