Help with writing a free verse poem?

I find that it's much easier for me to write metered poetry than free verse. I can tell right away if the metered poem isn't flowing smoothing based on the sound. I still want my free verse poem to have that musical sound to it, but don't know how to get it to sound good without the meter.How can I get my free verse poem to sound "right"? Also, what techniques are good when writing free verse (ex. lots of imagery, telling a story)?