Over the last few months I've discovered a simple way to get your story started. I've found that I can world build for months and months, but without a basic direction I become plagued by ideas changing to the point where I have to redo all my worldbuilding. I'm going to lay out some steps for building your story out of character, which you can then world build around. All you need to know to get started, is 
whom the story is about. 
I will provide links to my examples as I rewrite my first book and organize the development of Triterrus. You are free to post links to yours based on my steps, or even suggest some of your own. Feel free to make comments about what works or doesn't work with my steps. This are based off of the following sources: Michael Stackpole's 
21 Days to a Novel; Ben Bova's 
The Craft of Writing Science Fiction that Sells; and eventually pieces of Holly Lisle's 
How to Revise Your Novel. 
1. List 
two short term and one long term goal for your main characters. (This helps if you aren't sure who your MC will be. Once you have their goals laid out, you should have a better idea of whom you want to focus on.)
2. List the 
obstacles to achieving these goals (bonus points if one person's goal is the obstacle to the other person's goal). This should include setting details. Use this step to help discover the world in which your character is struggling. Instead of just coming up with all kinds of details, focus on details that create obstacles for your characters. 
3. Identify the 
emotional battle for each main character. For example, your character's main goal may be saving his kingdom (honor), but he is also a husband (love) and the obstacle is that he can't save his kingdom 
and be with his wife. Thus he has an honor vs. love battle. 
4. List some 
strengths which make your character unique, but 
also a glaring weakness. 
5. Find ways to 
insert conflict into the story which 
will cut deep into the heart of his weakness so that even up till the very end you don't know which path he will choose in his emotional battle. For my example, this could look like: MC's weakness is his marriage bond, and time and time again he will be forced to make decisions that will either help the kingdom and hurt his wife or comfort his wife and hurt the kingdom. Build the climax to the point where he will lose one or the other and then decide which one he would truly choose. 
* I'm not much of an outliner, but these steps were enough to give me a beginning and an end which kept me on track so that everything was leading towards the general ending I had in mind of which emotion my character was going to choose. 
6. Place your 
ticking time bomb. The ticking time bomb should be in your first scene. This will be a sign of your character's emotional struggle, or represent the struggle he is about to endure. Stackpole says to place this time bomb so that the character doesn't realize it is there at first. 
> In my latest book, The General's Shadow, the ticking time bomb was my MC willing to risk his crew's lives to get coordinates to a planet that might help him regain citizenship on his homeworld. This was an indicator of the emotional struggle between sacrifice and selfishness (in the context of leadership). 
* Once you have your ticking time bomb you are 
very close to being ready to start writing. 
7. Orson Scott Card says you need to have 
two separate ideas before you are ready to begin your story. 
> For example, his book Ender's Game has at least three ideas
a) Zero-gravity battle training
b) Take advantage of children's intelligence to use them to control galatic battleships under the ruse that they are playing video games
c) Earth was nearly destroyed by a bug race millions of light years away, and must prepare for the next invasion by bringing the fight to the bugs homeworld. 
8. 
Summarize your story in 30 words or less including:
a) Protagonist (two adjectives, not a name)
b) Antagonist (same)
c) Setting
d) Conflict (related to emotional battle, but more so how antagonist presents attack against protagonist's weakness)
e) Twist (surprise at the end which really throws protagonist for a loop, so that even he doesn't know what he is going to do, how or if he will succeed till the very end