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Everything (in your story) happens for a reason
Too often, beginning writers hear is, "Story must have conflict." The later understanding is that the conflict can come in many shapes and sizes. Conflict can be a direct interpretation of the word, like someone being chased by a knife-wielding crazy person, or an argument or a quest like you have in Lord of the Rings. But it can be, and often is, more subtle -- a man with ADD's struggle to appear normal.
Hrm...too close to home, perhaps.
The point is that every effective story has to have some reason to have been written. A story about a man standing, walking across the room, pouring himself a glass of water and sitting down at a table isn't a story at all. It's a description. It might even be written poetically, but to be a story, there needs to be some...conflict. Dammit.
Possible conflicts in this simple scenario:
- The man would need to have some difficulty in moving.
- He has made a bet that he could go a whole day without drinking water, so he knows that drinking the water would mean losing the bet.
- Maybe he's locked in the room and the crazy person who put him there only gave him water laced with drug that will force him to reveal a secret, thus making the decision to alleviate a trade-off.
Fun. This, really, is the part of writing that I tend to like -- the planning and justification of motivation and action.
And THAT'S why I was so shocked that I had totally neglected to do so in a recent story. I had an evil force descend on a situation and do a bunch of cool nasty stuff. The nature nasty stuff was so cool by itself, thought, that I forgot to give a reason why this particular evil person had decided to descent in this particular place and torture this other particular person.
Crap and damn.
Looking back, I realize that not only does the story have to have a conflict, it also has to have a reason for the conflict and a reason for selecting a place, and selecting a victim.
For the same reason that a character's actions must follow a logical stimulus, every element of the story must also have a logic justification for existing in the place and with the other characters in the story. Otherwise, you may as well be rolling dice.
So, I had a great story concept and a couple of great characters (all imho) but I failed to show why they were there and why they were pitted against one another. No concept or characters can overcome such a vacuum.
Moral: Right up front, give every story character specific, uncontrived justifications for his/her presence and deeds. The same can be said of setting, time, and plot.