I will see, hear, read, or think of something, an idea forms, then a story appears in my mind, much like a video. Once I finish watching the video, I put it on paper. Usually I only edit due to typos or some other foolish reason I put words where I did not intend them to be. The poem usually forms in my mind one or two lines at a time, & that is how they r put down. When in a mood like this, I will tend to think in rhyme, & either in ballad stanza or tetrameter couplets, & the biggest problem I encounter is to keep it consistent & switch back & forth. Sometimes after reading it aloud I will rearrange words or change something, but not often. Maybe if I did, I would get better.
Edit:
I do not think what I write is all that good, & am proud that others like it a bit.