Well, I've heard of people using index cards. Each card gets one idea or scene.
Color code them in some way - action - exposition - explaination...etc.
Then you can lay them out in front of you or pin them up on a wall and look at them.
See if there are any obvious flows of motion from one scene to the other.
You can move them around until you get something that works for you.
Suggestion - get a BASIC idea - a frame to fit these things into. Having a great scene idea
is nice but having a whole story to fit the scene into is better.