How do I write a poem, I really don't know. It starts with just a few words popping in my head, usually from something I've seen, heard, felt or read. Those words just feel like there are more to follow, so I start writing. If more words do follow I keep writing. When I'm done I put it away for a while. Then I read it a few times, first to see if what I wrote really makes any sense to me, then making little changes that make the words feel better. When I read it a few times and when I can't think of anything that make the words feel better, I'm done.
I don't know if my poems are any good, but I like writing them, they make me feel better once they are done. Of course I'm always open to suggestions.