Okay, so I am getting excited about trying my hand at writing my own lyrics. Where do I begin? Melody or story line? Or?

I have a roughed out story but no melody, yet.

I think Black Blues, ala "Mississippi" John Hurt or Muddy Waters, in a AAB format would be easiest for a rank amateur. I wrote the first verse last night but it lacks meter so I'm beginning to think that I need a melody to sync to first.

Man, we composers have our problems! Writer's block on day two?! LOL

TIA