Let writing be fluid. Open a document on your favorite word processor (I use Microsoft Office's Word), and start typing. Churning out whatever comes to mind may or may not result on good poetry, but it is a start. Bad poetry has its place. Hopefully, not in books, but it opens the mind into the discipline, which, in turn, helps develop better poetry.
I am not among those who wax poetically that poetry is what comes from inspiration. It requires that, to be sure, but mostly, hard work. A good poet is always inspired because he or she always see more than is obvious. The hard part is deciding on the proper form, finding the rhythm and tempo which fits the tone, and somehow saying something interesting beyond the words themselves.
Find a topic, any topic, be it as simple as some object around you. Then try to write a few rhyming lines. Rhymes are not required to make it a poem, but if you are new to this, it can help find the song in the poem.
The little poem below rhymes on ever second line, all the same sound. The rhythm, if you say it aloud, comes across like a country horse trotting slowly. There is nothing serious about the poem, and so, a silly rhythm made sense. Sing-songy? Yep. Bad poetry? Sure. I'm OK with that. The juices are flowing, and that's what matters. A good poem might follow later. (I hope so!)
Now, go read some of the good stuff.
How to Write a Poem
by Anthony Trendl
So you can see:
it can be done.
Just start a doc:
it’s so much fun.
Weave in a verb;
the poem’s spun.
Give it a try--
What’s done is done.