Free verse :
I've heard it said that free verse is the hardest of poetry to write, that it is the most difficult because it has no structure - because it is very close to being prose. Now, one way to avoid this is by taking the easy route and writing it all at one time with a burst of inspiration. Or, you could take the more difficult route and using the means that you may usually use to create poetry but you have to be very careful. You don't exactly want a story, but at the same time you do. The only difference is that you don't want a beginning middle and end that are planned accordingly, you want to move with the flow of the poem.
If the poem takes you somewhere else, then you should follow it. Remember - edit later, write now.