You know what I do whenever I start a story or a poem? I sit back, get comfy, and close my eyes. I think about what I want to say, how to word it, which words to use... Sure, it may seem a little odd, but it helps. Same with speaking out whatever you're writing as you go along, or even before you write it down, kind of like testing the words out.
If it doesn't help, there re still many other ways. Make a few rough copies, meld them together, revise it then make a final copy.. there's so much you can do to make the creative juices flow.. reading other peoples' works helps a little.. much luck Neves.