Always start with "It was a dark and stormy night, there was a gunshot, a scream,"
Write thirty pages of the worst, and dump it in a dumpster far from home late at night.
I never get it till after doing it wrong, characters take time to introduce themselves, you can give them traits, but keep knowing them and they will become real people, who can write their own lines.
They are not an action figure, giving the same response in all situations, they are one way at the office, and another when talking to their dog, kid, wife, it is catching the facets that makes it full and real.
Write lots of really bad stuff, go on, you know you want to!
Describe things, "Before him on the table was a.... he saw that it had a deep cultural meaning beyond it's common existance. Things, their relation to other things, to where a few short sentances can bring a vision of a time, a neighborhood,, and all the people that live there.
There is a background needed to tell a story, where are we? What is the meaning of this place? Then a letter came for Harry. Some is where they come from, which gives meaning to where they go.
Edit yourself harshly, it is about percentage of good stuff, do not accept less.