Some of you may be feeling as if you simply can't get the character(s) you are seeing in your head onto the page. Relax. This is normal for a first draft.
- Put them in confrontation after confrontation
- Afford them plenty of opportunities to lie, cheat and steal and see how they act
- See them at crossroad after crossroad where one path is in their best interest and the other is the right path, or the heroic path, or the unselfish path. In short, the second path is more likely to be the best moral choice.
Until you have put your characters through the first draft of your story, you will not only continue to feel you aren't fleshing them out, but you will feel a little unsure about who they are and what they would do given the chance to cheat on their taxes, cheat on their wife, steal from the boss or give to charity anonymously.
And often repeated recommendation throughout your storytelling: Put problems in your character's path and not in his past.